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Finding the Fourth Proportional to 628,712.01, 867,154.68 and 399,069.81

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Solution

The fourth proportional to 628,712.01, 867,154.68 and 399,069.81 is: 550,419.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,712.01 : 867,154.68 = 399,069.81 : x
  2. Step 2: Convert to fraction form
    628,712.01/867,154.68 = 399,069.81/x
  3. Step 3: Cross multiply
    628,712.01x = 867,154.68 × 399,069.81
  4. Step 4: Simplify right side
    628,712.01x = 346,055,253,388.21
  5. Step 5: Solve for x
    x = 346,055,253,388.21/628,712.01
  6. Step 6: Final answer
    x = 550,419.35

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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.