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Finding the Fourth Proportional to 418,515.53, 627,765.05 and 138,032.78

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Solution

The fourth proportional to 418,515.53, 627,765.05 and 138,032.78 is: 207,046.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,515.53 : 627,765.05 = 138,032.78 : x
  2. Step 2: Convert to fraction form
    418,515.53/627,765.05 = 138,032.78/x
  3. Step 3: Cross multiply
    418,515.53x = 627,765.05 × 138,032.78
  4. Step 4: Simplify right side
    418,515.53x = 86,652,152,244.60
  5. Step 5: Solve for x
    x = 86,652,152,244.60/418,515.53
  6. Step 6: Final answer
    x = 207,046.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.