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Finding the Fourth Proportional to 8,648.40, 12,972.60 and 5,149.20

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Solution

The fourth proportional to 8,648.40, 12,972.60 and 5,149.20 is: 7,723.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,648.40 : 12,972.60 = 5,149.20 : x
  2. Step 2: Convert to fraction form
    8,648.40/12,972.60 = 5,149.20/x
  3. Step 3: Cross multiply
    8,648.40x = 12,972.60 × 5,149.20
  4. Step 4: Simplify right side
    8,648.40x = 66,798,511.92
  5. Step 5: Solve for x
    x = 66,798,511.92/8,648.40
  6. Step 6: Final answer
    x = 7,723.80

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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.