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Finding the Fourth Proportional to 927.11, 1,279.23 and 553.95

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Solution

The fourth proportional to 927.11, 1,279.23 and 553.95 is: 764.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.11 : 1,279.23 = 553.95 : x
  2. Step 2: Convert to fraction form
    927.11/1,279.23 = 553.95/x
  3. Step 3: Cross multiply
    927.11x = 1,279.23 × 553.95
  4. Step 4: Simplify right side
    927.11x = 708,627.38
  5. Step 5: Solve for x
    x = 708,627.38/927.11
  6. Step 6: Final answer
    x = 764.34

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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.