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Finding the Fourth Proportional to 658.39, 987.58 and 171.45

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Solution

The fourth proportional to 658.39, 987.58 and 171.45 is: 257.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.39 : 987.58 = 171.45 : x
  2. Step 2: Convert to fraction form
    658.39/987.58 = 171.45/x
  3. Step 3: Cross multiply
    658.39x = 987.58 × 171.45
  4. Step 4: Simplify right side
    658.39x = 169,320.59
  5. Step 5: Solve for x
    x = 169,320.59/658.39
  6. Step 6: Final answer
    x = 257.17

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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.