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Finding the Fourth Proportional to 819.92, 1,131 and 764.72

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Solution

The fourth proportional to 819.92, 1,131 and 764.72 is: 1,054.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.92 : 1,131 = 764.72 : x
  2. Step 2: Convert to fraction form
    819.92/1,131 = 764.72/x
  3. Step 3: Cross multiply
    819.92x = 1,131 × 764.72
  4. Step 4: Simplify right side
    819.92x = 864,898.32
  5. Step 5: Solve for x
    x = 864,898.32/819.92
  6. Step 6: Final answer
    x = 1,054.86

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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.