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Finding the Fourth Proportional to 633.80, 874.79 and 385.28

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Solution

The fourth proportional to 633.80, 874.79 and 385.28 is: 531.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.80 : 874.79 = 385.28 : x
  2. Step 2: Convert to fraction form
    633.80/874.79 = 385.28/x
  3. Step 3: Cross multiply
    633.80x = 874.79 × 385.28
  4. Step 4: Simplify right side
    633.80x = 337,042.14
  5. Step 5: Solve for x
    x = 337,042.14/633.80
  6. Step 6: Final answer
    x = 531.78

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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.