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Finding the Fourth Proportional to 638.29, 880.91 and 376.39

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Solution

The fourth proportional to 638.29, 880.91 and 376.39 is: 519.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.29 : 880.91 = 376.39 : x
  2. Step 2: Convert to fraction form
    638.29/880.91 = 376.39/x
  3. Step 3: Cross multiply
    638.29x = 880.91 × 376.39
  4. Step 4: Simplify right side
    638.29x = 331,563.83
  5. Step 5: Solve for x
    x = 331,563.83/638.29
  6. Step 6: Final answer
    x = 519.46

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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.