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Finding the Fourth Proportional to 721.99, 1,080.60 and 392.42

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Solution

The fourth proportional to 721.99, 1,080.60 and 392.42 is: 587.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.99 : 1,080.60 = 392.42 : x
  2. Step 2: Convert to fraction form
    721.99/1,080.60 = 392.42/x
  3. Step 3: Cross multiply
    721.99x = 1,080.60 × 392.42
  4. Step 4: Simplify right side
    721.99x = 424,049.05
  5. Step 5: Solve for x
    x = 424,049.05/721.99
  6. Step 6: Final answer
    x = 587.33

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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.