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Finding the Fourth Proportional to 91,781.10, 137,671.65 and 88,281.90

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Solution

The fourth proportional to 91,781.10, 137,671.65 and 88,281.90 is: 132,422.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,781.10 : 137,671.65 = 88,281.90 : x
  2. Step 2: Convert to fraction form
    91,781.10/137,671.65 = 88,281.90/x
  3. Step 3: Cross multiply
    91,781.10x = 137,671.65 × 88,281.90
  4. Step 4: Simplify right side
    91,781.10x = 12,153,914,838.14
  5. Step 5: Solve for x
    x = 12,153,914,838.14/91,781.10
  6. Step 6: Final answer
    x = 132,422.85

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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.