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Finding the Fourth Proportional to 390,127.38, 538,419.59 and 220,372.44

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Solution

The fourth proportional to 390,127.38, 538,419.59 and 220,372.44 is: 304,138.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,127.38 : 538,419.59 = 220,372.44 : x
  2. Step 2: Convert to fraction form
    390,127.38/538,419.59 = 220,372.44/x
  3. Step 3: Cross multiply
    390,127.38x = 538,419.59 × 220,372.44
  4. Step 4: Simplify right side
    390,127.38x = 118,652,838,792.10
  5. Step 5: Solve for x
    x = 118,652,838,792.10/390,127.38
  6. Step 6: Final answer
    x = 304,138.71

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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.