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Finding the Fourth Proportional to 2,487.44, 3,731.20 and 638.55

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Solution

The fourth proportional to 2,487.44, 3,731.20 and 638.55 is: 957.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,487.44 : 3,731.20 = 638.55 : x
  2. Step 2: Convert to fraction form
    2,487.44/3,731.20 = 638.55/x
  3. Step 3: Cross multiply
    2,487.44x = 3,731.20 × 638.55
  4. Step 4: Simplify right side
    2,487.44x = 2,382,556.16
  5. Step 5: Solve for x
    x = 2,382,556.16/2,487.44
  6. Step 6: Final answer
    x = 957.83

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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.