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Finding the Fourth Proportional to 390,151.48, 538,452.90 and 220,396.60

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Solution

The fourth proportional to 390,151.48, 538,452.90 and 220,396.60 is: 304,172.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,151.48 : 538,452.90 = 220,396.60 : x
  2. Step 2: Convert to fraction form
    390,151.48/538,452.90 = 220,396.60/x
  3. Step 3: Cross multiply
    390,151.48x = 538,452.90 × 220,396.60
  4. Step 4: Simplify right side
    390,151.48x = 118,673,188,420.14
  5. Step 5: Solve for x
    x = 118,673,188,420.14/390,151.48
  6. Step 6: Final answer
    x = 304,172.08

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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.