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Finding the Fourth Proportional to 721.10, 1,080.41 and 443.54

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Solution

The fourth proportional to 721.10, 1,080.41 and 443.54 is: 664.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.10 : 1,080.41 = 443.54 : x
  2. Step 2: Convert to fraction form
    721.10/1,080.41 = 443.54/x
  3. Step 3: Cross multiply
    721.10x = 1,080.41 × 443.54
  4. Step 4: Simplify right side
    721.10x = 479,205.53
  5. Step 5: Solve for x
    x = 479,205.53/721.10
  6. Step 6: Final answer
    x = 664.55

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Double scale
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1.5x scale

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.