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Finding the Fourth Proportional to 721.92, 993.92 and 618.24

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Solution

The fourth proportional to 721.92, 993.92 and 618.24 is: 851.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.92 : 993.92 = 618.24 : x
  2. Step 2: Convert to fraction form
    721.92/993.92 = 618.24/x
  3. Step 3: Cross multiply
    721.92x = 993.92 × 618.24
  4. Step 4: Simplify right side
    721.92x = 614,481.10
  5. Step 5: Solve for x
    x = 614,481.10/721.92
  6. Step 6: Final answer
    x = 851.18

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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.