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Finding the Fourth Proportional to 663,130.75, 915,120.57 and 361,324.75

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Solution

The fourth proportional to 663,130.75, 915,120.57 and 361,324.75 is: 498,628.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,130.75 : 915,120.57 = 361,324.75 : x
  2. Step 2: Convert to fraction form
    663,130.75/915,120.57 = 361,324.75/x
  3. Step 3: Cross multiply
    663,130.75x = 915,120.57 × 361,324.75
  4. Step 4: Simplify right side
    663,130.75x = 330,655,711,175.11
  5. Step 5: Solve for x
    x = 330,655,711,175.11/663,130.75
  6. Step 6: Final answer
    x = 498,628.23

Related Problems

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Half scale
Find fourth proportional to 1,326,261.50, 1,830,241.14 and 722,649.50
Double scale
Find fourth proportional to 663,131.75, 915,121.95 and 361,325.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.