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Finding the Fourth Proportional to 15,718.88, 21,691.87 and 8,645.15

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Solution

The fourth proportional to 15,718.88, 21,691.87 and 8,645.15 is: 11,930.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,718.88 : 21,691.87 = 8,645.15 : x
  2. Step 2: Convert to fraction form
    15,718.88/21,691.87 = 8,645.15/x
  3. Step 3: Cross multiply
    15,718.88x = 21,691.87 × 8,645.15
  4. Step 4: Simplify right side
    15,718.88x = 187,529,502.55
  5. Step 5: Solve for x
    x = 187,529,502.55/15,718.88
  6. Step 6: Final answer
    x = 11,930.21

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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.