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Finding the Fourth Proportional to 21,686.73, 32,520.92 and 6,891.68

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Solution

The fourth proportional to 21,686.73, 32,520.92 and 6,891.68 is: 10,334.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,686.73 : 32,520.92 = 6,891.68 : x
  2. Step 2: Convert to fraction form
    21,686.73/32,520.92 = 6,891.68/x
  3. Step 3: Cross multiply
    21,686.73x = 32,520.92 × 6,891.68
  4. Step 4: Simplify right side
    21,686.73x = 224,123,576.88
  5. Step 5: Solve for x
    x = 224,123,576.88/21,686.73
  6. Step 6: Final answer
    x = 10,334.60

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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.