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Finding the Fourth Proportional to 66,239.31, 99,337.89 and 21,857.79

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Solution

The fourth proportional to 66,239.31, 99,337.89 and 21,857.79 is: 32,779.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,239.31 : 99,337.89 = 21,857.79 : x
  2. Step 2: Convert to fraction form
    66,239.31/99,337.89 = 21,857.79/x
  3. Step 3: Cross multiply
    66,239.31x = 99,337.89 × 21,857.79
  4. Step 4: Simplify right side
    66,239.31x = 2,171,306,738.66
  5. Step 5: Solve for x
    x = 2,171,306,738.66/66,239.31
  6. Step 6: Final answer
    x = 32,779.73

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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.