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Finding the Fourth Proportional to 15,856.68, 21,882.92 and 8,687.08

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Solution

The fourth proportional to 15,856.68, 21,882.92 and 8,687.08 is: 11,988.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.68 : 21,882.92 = 8,687.08 : x
  2. Step 2: Convert to fraction form
    15,856.68/21,882.92 = 8,687.08/x
  3. Step 3: Cross multiply
    15,856.68x = 21,882.92 × 8,687.08
  4. Step 4: Simplify right side
    15,856.68x = 190,098,676.67
  5. Step 5: Solve for x
    x = 190,098,676.67/15,856.68
  6. Step 6: Final answer
    x = 11,988.55

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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.