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Finding the Fourth Proportional to 80,402.67, 120,609.80 and 21,237.57

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Solution

The fourth proportional to 80,402.67, 120,609.80 and 21,237.57 is: 31,857.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,402.67 : 120,609.80 = 21,237.57 : x
  2. Step 2: Convert to fraction form
    80,402.67/120,609.80 = 21,237.57/x
  3. Step 3: Cross multiply
    80,402.67x = 120,609.80 × 21,237.57
  4. Step 4: Simplify right side
    80,402.67x = 2,561,458,964.00
  5. Step 5: Solve for x
    x = 2,561,458,964.00/80,402.67
  6. Step 6: Final answer
    x = 31,857.88

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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.