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Finding the Fourth Proportional to 658.90, 988.28 and 171.95

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Solution

The fourth proportional to 658.90, 988.28 and 171.95 is: 257.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.90 : 988.28 = 171.95 : x
  2. Step 2: Convert to fraction form
    658.90/988.28 = 171.95/x
  3. Step 3: Cross multiply
    658.90x = 988.28 × 171.95
  4. Step 4: Simplify right side
    658.90x = 169,929.59
  5. Step 5: Solve for x
    x = 169,929.59/658.90
  6. Step 6: Final answer
    x = 257.90

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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.