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Finding the Fourth Proportional to 90,781.60, 135,903.60 and 67,511.20

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Solution

The fourth proportional to 90,781.60, 135,903.60 and 67,511.20 is: 101,066.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,781.60 : 135,903.60 = 67,511.20 : x
  2. Step 2: Convert to fraction form
    90,781.60/135,903.60 = 67,511.20/x
  3. Step 3: Cross multiply
    90,781.60x = 135,903.60 × 67,511.20
  4. Step 4: Simplify right side
    90,781.60x = 9,175,015,120.32
  5. Step 5: Solve for x
    x = 9,175,015,120.32/90,781.60
  6. Step 6: Final answer
    x = 101,066.90

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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.