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Finding the Fourth Proportional to 123,691.88, 170,854.98 and 91,492

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Solution

The fourth proportional to 123,691.88, 170,854.98 and 91,492 is: 126,377.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,691.88 : 170,854.98 = 91,492 : x
  2. Step 2: Convert to fraction form
    123,691.88/170,854.98 = 91,492/x
  3. Step 3: Cross multiply
    123,691.88x = 170,854.98 × 91,492
  4. Step 4: Simplify right side
    123,691.88x = 15,631,863,830.16
  5. Step 5: Solve for x
    x = 15,631,863,830.16/123,691.88
  6. Step 6: Final answer
    x = 126,377.45

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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.