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Finding the Fourth Proportional to 90,630.70, 135,812.40 and 65,723.20

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Solution

The fourth proportional to 90,630.70, 135,812.40 and 65,723.20 is: 98,487.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,630.70 : 135,812.40 = 65,723.20 : x
  2. Step 2: Convert to fraction form
    90,630.70/135,812.40 = 65,723.20/x
  3. Step 3: Cross multiply
    90,630.70x = 135,812.40 × 65,723.20
  4. Step 4: Simplify right side
    90,630.70x = 8,926,025,527.68
  5. Step 5: Solve for x
    x = 8,926,025,527.68/90,630.70
  6. Step 6: Final answer
    x = 98,487.88

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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.