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Finding the Fourth Proportional to 743.92, 1,115.88 and 658.26

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Solution

The fourth proportional to 743.92, 1,115.88 and 658.26 is: 987.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.92 : 1,115.88 = 658.26 : x
  2. Step 2: Convert to fraction form
    743.92/1,115.88 = 658.26/x
  3. Step 3: Cross multiply
    743.92x = 1,115.88 × 658.26
  4. Step 4: Simplify right side
    743.92x = 734,539.17
  5. Step 5: Solve for x
    x = 734,539.17/743.92
  6. Step 6: Final answer
    x = 987.39

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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.