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Finding the Fourth Proportional to 418,649.60, 627,886.50 and 138,101.12

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Solution

The fourth proportional to 418,649.60, 627,886.50 and 138,101.12 is: 207,122.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,649.60 : 627,886.50 = 138,101.12 : x
  2. Step 2: Convert to fraction form
    418,649.60/627,886.50 = 138,101.12/x
  3. Step 3: Cross multiply
    418,649.60x = 627,886.50 × 138,101.12
  4. Step 4: Simplify right side
    418,649.60x = 86,711,828,882.88
  5. Step 5: Solve for x
    x = 86,711,828,882.88/418,649.60
  6. Step 6: Final answer
    x = 207,122.68

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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.