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Finding the Fourth Proportional to 637.49, 878.90 and 450.78

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Solution

The fourth proportional to 637.49, 878.90 and 450.78 is: 621.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.49 : 878.90 = 450.78 : x
  2. Step 2: Convert to fraction form
    637.49/878.90 = 450.78/x
  3. Step 3: Cross multiply
    637.49x = 878.90 × 450.78
  4. Step 4: Simplify right side
    637.49x = 396,188.29
  5. Step 5: Solve for x
    x = 396,188.29/637.49
  6. Step 6: Final answer
    x = 621.49

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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.