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Finding the Fourth Proportional to 12,221.88, 18,332.81 and 2,987.88

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Solution

The fourth proportional to 12,221.88, 18,332.81 and 2,987.88 is: 4,481.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,221.88 : 18,332.81 = 2,987.88 : x
  2. Step 2: Convert to fraction form
    12,221.88/18,332.81 = 2,987.88/x
  3. Step 3: Cross multiply
    12,221.88x = 18,332.81 × 2,987.88
  4. Step 4: Simplify right side
    12,221.88x = 54,776,236.34
  5. Step 5: Solve for x
    x = 54,776,236.34/12,221.88
  6. Step 6: Final answer
    x = 4,481.82

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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.