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Finding the Fourth Proportional to 634.20, 875.21 and 385.49

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Solution

The fourth proportional to 634.20, 875.21 and 385.49 is: 531.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.20 : 875.21 = 385.49 : x
  2. Step 2: Convert to fraction form
    634.20/875.21 = 385.49/x
  3. Step 3: Cross multiply
    634.20x = 875.21 × 385.49
  4. Step 4: Simplify right side
    634.20x = 337,378.40
  5. Step 5: Solve for x
    x = 337,378.40/634.20
  6. Step 6: Final answer
    x = 531.97

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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.