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Finding the Fourth Proportional to 91,687.80, 137,531.70 and 68,359.80

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Solution

The fourth proportional to 91,687.80, 137,531.70 and 68,359.80 is: 102,539.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,687.80 : 137,531.70 = 68,359.80 : x
  2. Step 2: Convert to fraction form
    91,687.80/137,531.70 = 68,359.80/x
  3. Step 3: Cross multiply
    91,687.80x = 137,531.70 × 68,359.80
  4. Step 4: Simplify right side
    91,687.80x = 9,401,639,505.66
  5. Step 5: Solve for x
    x = 9,401,639,505.66/91,687.80
  6. Step 6: Final answer
    x = 102,539.70

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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.