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Finding the Fourth Proportional to 8,461.20, 12,691.80 and 4,079.10

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Solution

The fourth proportional to 8,461.20, 12,691.80 and 4,079.10 is: 6,118.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,461.20 : 12,691.80 = 4,079.10 : x
  2. Step 2: Convert to fraction form
    8,461.20/12,691.80 = 4,079.10/x
  3. Step 3: Cross multiply
    8,461.20x = 12,691.80 × 4,079.10
  4. Step 4: Simplify right side
    8,461.20x = 51,771,121.38
  5. Step 5: Solve for x
    x = 51,771,121.38/8,461.20
  6. Step 6: Final answer
    x = 6,118.65

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.