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Finding the Fourth Proportional to 927.06, 1,279.31 and 553.96

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Solution

The fourth proportional to 927.06, 1,279.31 and 553.96 is: 764.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.06 : 1,279.31 = 553.96 : x
  2. Step 2: Convert to fraction form
    927.06/1,279.31 = 553.96/x
  3. Step 3: Cross multiply
    927.06x = 1,279.31 × 553.96
  4. Step 4: Simplify right side
    927.06x = 708,686.57
  5. Step 5: Solve for x
    x = 708,686.57/927.06
  6. Step 6: Final answer
    x = 764.45

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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.