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Finding the Fourth Proportional to 638.54, 881.15 and 376.57

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Solution

The fourth proportional to 638.54, 881.15 and 376.57 is: 519.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.54 : 881.15 = 376.57 : x
  2. Step 2: Convert to fraction form
    638.54/881.15 = 376.57/x
  3. Step 3: Cross multiply
    638.54x = 881.15 × 376.57
  4. Step 4: Simplify right side
    638.54x = 331,814.66
  5. Step 5: Solve for x
    x = 331,814.66/638.54
  6. Step 6: Final answer
    x = 519.65

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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.