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Finding the Fourth Proportional to 721.12, 1,080.74 and 330.98

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Solution

The fourth proportional to 721.12, 1,080.74 and 330.98 is: 496.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.12 : 1,080.74 = 330.98 : x
  2. Step 2: Convert to fraction form
    721.12/1,080.74 = 330.98/x
  3. Step 3: Cross multiply
    721.12x = 1,080.74 × 330.98
  4. Step 4: Simplify right side
    721.12x = 357,703.33
  5. Step 5: Solve for x
    x = 357,703.33/721.12
  6. Step 6: Final answer
    x = 496.04

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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.