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Finding the Fourth Proportional to 658.19, 987.29 and 189.71

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Solution

The fourth proportional to 658.19, 987.29 and 189.71 is: 284.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.19 : 987.29 = 189.71 : x
  2. Step 2: Convert to fraction form
    658.19/987.29 = 189.71/x
  3. Step 3: Cross multiply
    658.19x = 987.29 × 189.71
  4. Step 4: Simplify right side
    658.19x = 187,297.31
  5. Step 5: Solve for x
    x = 187,297.31/658.19
  6. Step 6: Final answer
    x = 284.56

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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.