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Finding the Fourth Proportional to 775.32, 1,161.36 and 721.86

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Solution

The fourth proportional to 775.32, 1,161.36 and 721.86 is: 1,081.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.32 : 1,161.36 = 721.86 : x
  2. Step 2: Convert to fraction form
    775.32/1,161.36 = 721.86/x
  3. Step 3: Cross multiply
    775.32x = 1,161.36 × 721.86
  4. Step 4: Simplify right side
    775.32x = 838,339.33
  5. Step 5: Solve for x
    x = 838,339.33/775.32
  6. Step 6: Final answer
    x = 1,081.28

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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.