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Finding the Fourth Proportional to 721.88, 1,080.42 and 448.20

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Solution

The fourth proportional to 721.88, 1,080.42 and 448.20 is: 670.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.88 : 1,080.42 = 448.20 : x
  2. Step 2: Convert to fraction form
    721.88/1,080.42 = 448.20/x
  3. Step 3: Cross multiply
    721.88x = 1,080.42 × 448.20
  4. Step 4: Simplify right side
    721.88x = 484,244.24
  5. Step 5: Solve for x
    x = 484,244.24/721.88
  6. Step 6: Final answer
    x = 670.81

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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.