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Finding the Fourth Proportional to 12,659.70, 18,989.55 and 8,231.10

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Solution

The fourth proportional to 12,659.70, 18,989.55 and 8,231.10 is: 12,346.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.70 : 18,989.55 = 8,231.10 : x
  2. Step 2: Convert to fraction form
    12,659.70/18,989.55 = 8,231.10/x
  3. Step 3: Cross multiply
    12,659.70x = 18,989.55 × 8,231.10
  4. Step 4: Simplify right side
    12,659.70x = 156,304,885.01
  5. Step 5: Solve for x
    x = 156,304,885.01/12,659.70
  6. Step 6: Final answer
    x = 12,346.65

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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.