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Finding the Fourth Proportional to 638.97, 881.76 and 376.97

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Solution

The fourth proportional to 638.97, 881.76 and 376.97 is: 520.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.97 : 881.76 = 376.97 : x
  2. Step 2: Convert to fraction form
    638.97/881.76 = 376.97/x
  3. Step 3: Cross multiply
    638.97x = 881.76 × 376.97
  4. Step 4: Simplify right side
    638.97x = 332,392.66
  5. Step 5: Solve for x
    x = 332,392.66/638.97
  6. Step 6: Final answer
    x = 520.20

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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.