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Finding the Fourth Proportional to 658.14, 987.21 and 171.18

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Solution

The fourth proportional to 658.14, 987.21 and 171.18 is: 256.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.14 : 987.21 = 171.18 : x
  2. Step 2: Convert to fraction form
    658.14/987.21 = 171.18/x
  3. Step 3: Cross multiply
    658.14x = 987.21 × 171.18
  4. Step 4: Simplify right side
    658.14x = 168,990.61
  5. Step 5: Solve for x
    x = 168,990.61/658.14
  6. Step 6: Final answer
    x = 256.77

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Similar ratio
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1.5x scale

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.