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Finding the Fourth Proportional to 138,958.90, 208,419.90 and 39,126.88

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Solution

The fourth proportional to 138,958.90, 208,419.90 and 39,126.88 is: 58,685.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,958.90 : 208,419.90 = 39,126.88 : x
  2. Step 2: Convert to fraction form
    138,958.90/208,419.90 = 39,126.88/x
  3. Step 3: Cross multiply
    138,958.90x = 208,419.90 × 39,126.88
  4. Step 4: Simplify right side
    138,958.90x = 8,154,821,053.15
  5. Step 5: Solve for x
    x = 8,154,821,053.15/138,958.90
  6. Step 6: Final answer
    x = 58,685.13

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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.