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Finding the Fourth Proportional to 15,171.18, 20,936.96 and 8,456.87

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Solution

The fourth proportional to 15,171.18, 20,936.96 and 8,456.87 is: 11,670.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,171.18 : 20,936.96 = 8,456.87 : x
  2. Step 2: Convert to fraction form
    15,171.18/20,936.96 = 8,456.87/x
  3. Step 3: Cross multiply
    15,171.18x = 20,936.96 × 8,456.87
  4. Step 4: Simplify right side
    15,171.18x = 177,061,001.95
  5. Step 5: Solve for x
    x = 177,061,001.95/15,171.18
  6. Step 6: Final answer
    x = 11,670.88

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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.