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Finding the Fourth Proportional to 658.80, 985.37 and 641.12

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Solution

The fourth proportional to 658.80, 985.37 and 641.12 is: 958.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.80 : 985.37 = 641.12 : x
  2. Step 2: Convert to fraction form
    658.80/985.37 = 641.12/x
  3. Step 3: Cross multiply
    658.80x = 985.37 × 641.12
  4. Step 4: Simplify right side
    658.80x = 631,732.28
  5. Step 5: Solve for x
    x = 631,732.28/658.80
  6. Step 6: Final answer
    x = 958.91

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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.