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Finding the Fourth Proportional to 12,487.80, 18,731.88 and 3,722.79

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Solution

The fourth proportional to 12,487.80, 18,731.88 and 3,722.79 is: 5,584.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.80 : 18,731.88 = 3,722.79 : x
  2. Step 2: Convert to fraction form
    12,487.80/18,731.88 = 3,722.79/x
  3. Step 3: Cross multiply
    12,487.80x = 18,731.88 × 3,722.79
  4. Step 4: Simplify right side
    12,487.80x = 69,734,855.55
  5. Step 5: Solve for x
    x = 69,734,855.55/12,487.80
  6. Step 6: Final answer
    x = 5,584.24

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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.