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Finding the Fourth Proportional to 928.17, 1,279.11 and 665.73

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Solution

The fourth proportional to 928.17, 1,279.11 and 665.73 is: 917.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.17 : 1,279.11 = 665.73 : x
  2. Step 2: Convert to fraction form
    928.17/1,279.11 = 665.73/x
  3. Step 3: Cross multiply
    928.17x = 1,279.11 × 665.73
  4. Step 4: Simplify right side
    928.17x = 851,541.90
  5. Step 5: Solve for x
    x = 851,541.90/928.17
  6. Step 6: Final answer
    x = 917.44

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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.