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Finding the Fourth Proportional to 634.40, 875.34 and 385.86

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Solution

The fourth proportional to 634.40, 875.34 and 385.86 is: 532.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.40 : 875.34 = 385.86 : x
  2. Step 2: Convert to fraction form
    634.40/875.34 = 385.86/x
  3. Step 3: Cross multiply
    634.40x = 875.34 × 385.86
  4. Step 4: Simplify right side
    634.40x = 337,758.69
  5. Step 5: Solve for x
    x = 337,758.69/634.40
  6. Step 6: Final answer
    x = 532.41

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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.