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Finding the Fourth Proportional to 138,728.28, 207,958.44 and 63,900

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Solution

The fourth proportional to 138,728.28, 207,958.44 and 63,900 is: 95,788.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,728.28 : 207,958.44 = 63,900 : x
  2. Step 2: Convert to fraction form
    138,728.28/207,958.44 = 63,900/x
  3. Step 3: Cross multiply
    138,728.28x = 207,958.44 × 63,900
  4. Step 4: Simplify right side
    138,728.28x = 13,288,544,316
  5. Step 5: Solve for x
    x = 13,288,544,316/138,728.28
  6. Step 6: Final answer
    x = 95,788.29

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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.