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Finding the Fourth Proportional to 15,691.68, 21,652.62 and 8,977.56

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Solution

The fourth proportional to 15,691.68, 21,652.62 and 8,977.56 is: 12,387.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.68 : 21,652.62 = 8,977.56 : x
  2. Step 2: Convert to fraction form
    15,691.68/21,652.62 = 8,977.56/x
  3. Step 3: Cross multiply
    15,691.68x = 21,652.62 × 8,977.56
  4. Step 4: Simplify right side
    15,691.68x = 194,387,695.21
  5. Step 5: Solve for x
    x = 194,387,695.21/15,691.68
  6. Step 6: Final answer
    x = 12,387.95

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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.