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Finding the Fourth Proportional to 658.15, 987.46 and 398.32

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Solution

The fourth proportional to 658.15, 987.46 and 398.32 is: 597.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.15 : 987.46 = 398.32 : x
  2. Step 2: Convert to fraction form
    658.15/987.46 = 398.32/x
  3. Step 3: Cross multiply
    658.15x = 987.46 × 398.32
  4. Step 4: Simplify right side
    658.15x = 393,321.60
  5. Step 5: Solve for x
    x = 393,321.60/658.15
  6. Step 6: Final answer
    x = 597.62

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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.