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Finding the Fourth Proportional to 418,915.25, 628,470.07 and 138,415.49

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Solution

The fourth proportional to 418,915.25, 628,470.07 and 138,415.49 is: 207,655.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,915.25 : 628,470.07 = 138,415.49 : x
  2. Step 2: Convert to fraction form
    418,915.25/628,470.07 = 138,415.49/x
  3. Step 3: Cross multiply
    418,915.25x = 628,470.07 × 138,415.49
  4. Step 4: Simplify right side
    418,915.25x = 86,989,992,689.38
  5. Step 5: Solve for x
    x = 86,989,992,689.38/418,915.25
  6. Step 6: Final answer
    x = 207,655.35

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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.