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Finding the Fourth Proportional to 66,456.45, 99,697.28 and 21,489.89

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Solution

The fourth proportional to 66,456.45, 99,697.28 and 21,489.89 is: 32,238.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,456.45 : 99,697.28 = 21,489.89 : x
  2. Step 2: Convert to fraction form
    66,456.45/99,697.28 = 21,489.89/x
  3. Step 3: Cross multiply
    66,456.45x = 99,697.28 × 21,489.89
  4. Step 4: Simplify right side
    66,456.45x = 2,142,482,974.56
  5. Step 5: Solve for x
    x = 2,142,482,974.56/66,456.45
  6. Step 6: Final answer
    x = 32,238.90

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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.