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Finding the Fourth Proportional to 15,718.78, 21,691.92 and 8,645.68

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Solution

The fourth proportional to 15,718.78, 21,691.92 and 8,645.68 is: 11,931.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,718.78 : 21,691.92 = 8,645.68 : x
  2. Step 2: Convert to fraction form
    15,718.78/21,691.92 = 8,645.68/x
  3. Step 3: Cross multiply
    15,718.78x = 21,691.92 × 8,645.68
  4. Step 4: Simplify right side
    15,718.78x = 187,541,398.91
  5. Step 5: Solve for x
    x = 187,541,398.91/15,718.78
  6. Step 6: Final answer
    x = 11,931.04

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1.5x scale

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.