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Finding the Fourth Proportional to 8,458.80, 12,688.20 and 8,385.90

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Solution

The fourth proportional to 8,458.80, 12,688.20 and 8,385.90 is: 12,578.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,458.80 : 12,688.20 = 8,385.90 : x
  2. Step 2: Convert to fraction form
    8,458.80/12,688.20 = 8,385.90/x
  3. Step 3: Cross multiply
    8,458.80x = 12,688.20 × 8,385.90
  4. Step 4: Simplify right side
    8,458.80x = 106,401,976.38
  5. Step 5: Solve for x
    x = 106,401,976.38/8,458.80
  6. Step 6: Final answer
    x = 12,578.85

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Double scale
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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.