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Finding the Fourth Proportional to 12,991.92, 19,487.88 and 3,757.92

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Solution

The fourth proportional to 12,991.92, 19,487.88 and 3,757.92 is: 5,636.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.92 : 19,487.88 = 3,757.92 : x
  2. Step 2: Convert to fraction form
    12,991.92/19,487.88 = 3,757.92/x
  3. Step 3: Cross multiply
    12,991.92x = 19,487.88 × 3,757.92
  4. Step 4: Simplify right side
    12,991.92x = 73,233,894.01
  5. Step 5: Solve for x
    x = 73,233,894.01/12,991.92
  6. Step 6: Final answer
    x = 5,636.88

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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.