Home / 8,115.60-12,149.10-7,240.80

Finding the Fourth Proportional to 8,115.60, 12,149.10 and 7,240.80

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Solution

The fourth proportional to 8,115.60, 12,149.10 and 7,240.80 is: 10,839.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115.60 : 12,149.10 = 7,240.80 : x
  2. Step 2: Convert to fraction form
    8,115.60/12,149.10 = 7,240.80/x
  3. Step 3: Cross multiply
    8,115.60x = 12,149.10 × 7,240.80
  4. Step 4: Simplify right side
    8,115.60x = 87,969,203.28
  5. Step 5: Solve for x
    x = 87,969,203.28/8,115.60
  6. Step 6: Final answer
    x = 10,839.52

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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.