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Finding the Fourth Proportional to 721.92, 1,080.72 and 662.88

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Solution

The fourth proportional to 721.92, 1,080.72 and 662.88 is: 992.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.92 : 1,080.72 = 662.88 : x
  2. Step 2: Convert to fraction form
    721.92/1,080.72 = 662.88/x
  3. Step 3: Cross multiply
    721.92x = 1,080.72 × 662.88
  4. Step 4: Simplify right side
    721.92x = 716,387.67
  5. Step 5: Solve for x
    x = 716,387.67/721.92
  6. Step 6: Final answer
    x = 992.34

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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.