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Finding the Fourth Proportional to 634.15, 875.15 and 385.43

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Solution

The fourth proportional to 634.15, 875.15 and 385.43 is: 531.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.15 : 875.15 = 385.43 : x
  2. Step 2: Convert to fraction form
    634.15/875.15 = 385.43/x
  3. Step 3: Cross multiply
    634.15x = 875.15 × 385.43
  4. Step 4: Simplify right side
    634.15x = 337,306.37
  5. Step 5: Solve for x
    x = 337,306.37/634.15
  6. Step 6: Final answer
    x = 531.91

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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.