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Finding the Fourth Proportional to 721.85, 1,081.97 and 282.96

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Solution

The fourth proportional to 721.85, 1,081.97 and 282.96 is: 424.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.85 : 1,081.97 = 282.96 : x
  2. Step 2: Convert to fraction form
    721.85/1,081.97 = 282.96/x
  3. Step 3: Cross multiply
    721.85x = 1,081.97 × 282.96
  4. Step 4: Simplify right side
    721.85x = 306,158.51
  5. Step 5: Solve for x
    x = 306,158.51/721.85
  6. Step 6: Final answer
    x = 424.13

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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.