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Finding the Fourth Proportional to 91,129.60, 136,694.40 and 87,630.40

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Solution

The fourth proportional to 91,129.60, 136,694.40 and 87,630.40 is: 131,445.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,129.60 : 136,694.40 = 87,630.40 : x
  2. Step 2: Convert to fraction form
    91,129.60/136,694.40 = 87,630.40/x
  3. Step 3: Cross multiply
    91,129.60x = 136,694.40 × 87,630.40
  4. Step 4: Simplify right side
    91,129.60x = 11,978,584,949.76
  5. Step 5: Solve for x
    x = 11,978,584,949.76/91,129.60
  6. Step 6: Final answer
    x = 131,445.60

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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.