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Finding the Fourth Proportional to 638.47, 881.06 and 372.88

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Solution

The fourth proportional to 638.47, 881.06 and 372.88 is: 514.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.47 : 881.06 = 372.88 : x
  2. Step 2: Convert to fraction form
    638.47/881.06 = 372.88/x
  3. Step 3: Cross multiply
    638.47x = 881.06 × 372.88
  4. Step 4: Simplify right side
    638.47x = 328,529.65
  5. Step 5: Solve for x
    x = 328,529.65/638.47
  6. Step 6: Final answer
    x = 514.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.