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Finding the Fourth Proportional to 638.54, 881.19 and 376.56

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Solution

The fourth proportional to 638.54, 881.19 and 376.56 is: 519.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.54 : 881.19 = 376.56 : x
  2. Step 2: Convert to fraction form
    638.54/881.19 = 376.56/x
  3. Step 3: Cross multiply
    638.54x = 881.19 × 376.56
  4. Step 4: Simplify right side
    638.54x = 331,820.91
  5. Step 5: Solve for x
    x = 331,820.91/638.54
  6. Step 6: Final answer
    x = 519.66

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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.