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Finding the Fourth Proportional to 8,657.52, 12,990.12 and 8,630.64

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Solution

The fourth proportional to 8,657.52, 12,990.12 and 8,630.64 is: 12,949.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,657.52 : 12,990.12 = 8,630.64 : x
  2. Step 2: Convert to fraction form
    8,657.52/12,990.12 = 8,630.64/x
  3. Step 3: Cross multiply
    8,657.52x = 12,990.12 × 8,630.64
  4. Step 4: Simplify right side
    8,657.52x = 112,113,049.28
  5. Step 5: Solve for x
    x = 112,113,049.28/8,657.52
  6. Step 6: Final answer
    x = 12,949.79

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Half scale
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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.