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Finding the Fourth Proportional to 123,711.81, 170,721.53 and 67,121.97

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Solution

The fourth proportional to 123,711.81, 170,721.53 and 67,121.97 is: 92,627.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,711.81 : 170,721.53 = 67,121.97 : x
  2. Step 2: Convert to fraction form
    123,711.81/170,721.53 = 67,121.97/x
  3. Step 3: Cross multiply
    123,711.81x = 170,721.53 × 67,121.97
  4. Step 4: Simplify right side
    123,711.81x = 11,459,165,079.40
  5. Step 5: Solve for x
    x = 11,459,165,079.40/123,711.81
  6. Step 6: Final answer
    x = 92,627.90

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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.