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Finding the Fourth Proportional to 231,079.59, 318,850.98 and 129,101.16

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Solution

The fourth proportional to 231,079.59, 318,850.98 and 129,101.16 is: 178,137.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,079.59 : 318,850.98 = 129,101.16 : x
  2. Step 2: Convert to fraction form
    231,079.59/318,850.98 = 129,101.16/x
  3. Step 3: Cross multiply
    231,079.59x = 318,850.98 × 129,101.16
  4. Step 4: Simplify right side
    231,079.59x = 41,164,031,385.14
  5. Step 5: Solve for x
    x = 41,164,031,385.14/231,079.59
  6. Step 6: Final answer
    x = 178,137.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.