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Finding the Fourth Proportional to 638.34, 880.91 and 372.79

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Solution

The fourth proportional to 638.34, 880.91 and 372.79 is: 514.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.34 : 880.91 = 372.79 : x
  2. Step 2: Convert to fraction form
    638.34/880.91 = 372.79/x
  3. Step 3: Cross multiply
    638.34x = 880.91 × 372.79
  4. Step 4: Simplify right side
    638.34x = 328,397.57
  5. Step 5: Solve for x
    x = 328,397.57/638.34
  6. Step 6: Final answer
    x = 514.46

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1.5x scale

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.