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Finding the Fourth Proportional to 862.70, 1,294.49 and 658.58

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Solution

The fourth proportional to 862.70, 1,294.49 and 658.58 is: 988.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.70 : 1,294.49 = 658.58 : x
  2. Step 2: Convert to fraction form
    862.70/1,294.49 = 658.58/x
  3. Step 3: Cross multiply
    862.70x = 1,294.49 × 658.58
  4. Step 4: Simplify right side
    862.70x = 852,520.40
  5. Step 5: Solve for x
    x = 852,520.40/862.70
  6. Step 6: Final answer
    x = 988.21

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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.