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Finding the Fourth Proportional to 72,512.80, 108,724.80 and 66,324.96

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Solution

The fourth proportional to 72,512.80, 108,724.80 and 66,324.96 is: 99,446.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,512.80 : 108,724.80 = 66,324.96 : x
  2. Step 2: Convert to fraction form
    72,512.80/108,724.80 = 66,324.96/x
  3. Step 3: Cross multiply
    72,512.80x = 108,724.80 × 66,324.96
  4. Step 4: Simplify right side
    72,512.80x = 7,211,168,011.01
  5. Step 5: Solve for x
    x = 7,211,168,011.01/72,512.80
  6. Step 6: Final answer
    x = 99,446.83

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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.