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Finding the Fourth Proportional to 458.31, 686.39 and 385.95

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Solution

The fourth proportional to 458.31, 686.39 and 385.95 is: 578.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.31 : 686.39 = 385.95 : x
  2. Step 2: Convert to fraction form
    458.31/686.39 = 385.95/x
  3. Step 3: Cross multiply
    458.31x = 686.39 × 385.95
  4. Step 4: Simplify right side
    458.31x = 264,910.29
  5. Step 5: Solve for x
    x = 264,910.29/458.31
  6. Step 6: Final answer
    x = 578.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.