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Finding the Fourth Proportional to 658.54, 986.43 and 397.72

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Solution

The fourth proportional to 658.54, 986.43 and 397.72 is: 595.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.54 : 986.43 = 397.72 : x
  2. Step 2: Convert to fraction form
    658.54/986.43 = 397.72/x
  3. Step 3: Cross multiply
    658.54x = 986.43 × 397.72
  4. Step 4: Simplify right side
    658.54x = 392,322.94
  5. Step 5: Solve for x
    x = 392,322.94/658.54
  6. Step 6: Final answer
    x = 595.75

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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.