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Finding the Fourth Proportional to 638.49, 881.05 and 372.86

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Solution

The fourth proportional to 638.49, 881.05 and 372.86 is: 514.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.49 : 881.05 = 372.86 : x
  2. Step 2: Convert to fraction form
    638.49/881.05 = 372.86/x
  3. Step 3: Cross multiply
    638.49x = 881.05 × 372.86
  4. Step 4: Simplify right side
    638.49x = 328,510.97
  5. Step 5: Solve for x
    x = 328,510.97/638.49
  6. Step 6: Final answer
    x = 514.51

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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.