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Finding the Fourth Proportional to 91,221.28, 125,956.56 and 69,966.88

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Solution

The fourth proportional to 91,221.28, 125,956.56 and 69,966.88 is: 96,608.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,221.28 : 125,956.56 = 69,966.88 : x
  2. Step 2: Convert to fraction form
    91,221.28/125,956.56 = 69,966.88/x
  3. Step 3: Cross multiply
    91,221.28x = 125,956.56 × 69,966.88
  4. Step 4: Simplify right side
    91,221.28x = 8,812,787,518.73
  5. Step 5: Solve for x
    x = 8,812,787,518.73/91,221.28
  6. Step 6: Final answer
    x = 96,608.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.