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Finding the Fourth Proportional to 1,078.50, 1,487.97 and 658.70

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Solution

The fourth proportional to 1,078.50, 1,487.97 and 658.70 is: 908.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.50 : 1,487.97 = 658.70 : x
  2. Step 2: Convert to fraction form
    1,078.50/1,487.97 = 658.70/x
  3. Step 3: Cross multiply
    1,078.50x = 1,487.97 × 658.70
  4. Step 4: Simplify right side
    1,078.50x = 980,115.11
  5. Step 5: Solve for x
    x = 980,115.11/1,078.50
  6. Step 6: Final answer
    x = 908.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.