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Finding the Fourth Proportional to 15,105.38, 20,840.49 and 8,731.13

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Solution

The fourth proportional to 15,105.38, 20,840.49 and 8,731.13 is: 12,046.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.38 : 20,840.49 = 8,731.13 : x
  2. Step 2: Convert to fraction form
    15,105.38/20,840.49 = 8,731.13/x
  3. Step 3: Cross multiply
    15,105.38x = 20,840.49 × 8,731.13
  4. Step 4: Simplify right side
    15,105.38x = 181,960,923.25
  5. Step 5: Solve for x
    x = 181,960,923.25/15,105.38
  6. Step 6: Final answer
    x = 12,046.10

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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.