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Finding the Fourth Proportional to 99,781.20, 149,671.80 and 88,117.20

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Solution

The fourth proportional to 99,781.20, 149,671.80 and 88,117.20 is: 132,175.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,781.20 : 149,671.80 = 88,117.20 : x
  2. Step 2: Convert to fraction form
    99,781.20/149,671.80 = 88,117.20/x
  3. Step 3: Cross multiply
    99,781.20x = 149,671.80 × 88,117.20
  4. Step 4: Simplify right side
    99,781.20x = 13,188,659,934.96
  5. Step 5: Solve for x
    x = 13,188,659,934.96/99,781.20
  6. Step 6: Final answer
    x = 132,175.80

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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.