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Finding the Fourth Proportional to 874.40, 1,309.89 and 658.22

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Solution

The fourth proportional to 874.40, 1,309.89 and 658.22 is: 986.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.40 : 1,309.89 = 658.22 : x
  2. Step 2: Convert to fraction form
    874.40/1,309.89 = 658.22/x
  3. Step 3: Cross multiply
    874.40x = 1,309.89 × 658.22
  4. Step 4: Simplify right side
    874.40x = 862,195.80
  5. Step 5: Solve for x
    x = 862,195.80/874.40
  6. Step 6: Final answer
    x = 986.04

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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.