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Finding the Fourth Proportional to 638.94, 881.71 and 376.91

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Solution

The fourth proportional to 638.94, 881.71 and 376.91 is: 520.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.94 : 881.71 = 376.91 : x
  2. Step 2: Convert to fraction form
    638.94/881.71 = 376.91/x
  3. Step 3: Cross multiply
    638.94x = 881.71 × 376.91
  4. Step 4: Simplify right side
    638.94x = 332,319.97
  5. Step 5: Solve for x
    x = 332,319.97/638.94
  6. Step 6: Final answer
    x = 520.11

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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.