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Finding the Fourth Proportional to 12,212.60, 18,318.90 and 12,139.70

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Solution

The fourth proportional to 12,212.60, 18,318.90 and 12,139.70 is: 18,209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,212.60 : 18,318.90 = 12,139.70 : x
  2. Step 2: Convert to fraction form
    12,212.60/18,318.90 = 12,139.70/x
  3. Step 3: Cross multiply
    12,212.60x = 18,318.90 × 12,139.70
  4. Step 4: Simplify right side
    12,212.60x = 222,385,950.33
  5. Step 5: Solve for x
    x = 222,385,950.33/12,212.60
  6. Step 6: Final answer
    x = 18,209.55

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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.