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Finding the Fourth Proportional to 99,691.60, 149,318.70 and 88,610.80

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Solution

The fourth proportional to 99,691.60, 149,318.70 and 88,610.80 is: 132,721.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,691.60 : 149,318.70 = 88,610.80 : x
  2. Step 2: Convert to fraction form
    99,691.60/149,318.70 = 88,610.80/x
  3. Step 3: Cross multiply
    99,691.60x = 149,318.70 × 88,610.80
  4. Step 4: Simplify right side
    99,691.60x = 13,231,249,461.96
  5. Step 5: Solve for x
    x = 13,231,249,461.96/99,691.60
  6. Step 6: Final answer
    x = 132,721.81

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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.