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Finding the Fourth Proportional to 721.29, 1,081.84 and 412.14

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Solution

The fourth proportional to 721.29, 1,081.84 and 412.14 is: 618.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.29 : 1,081.84 = 412.14 : x
  2. Step 2: Convert to fraction form
    721.29/1,081.84 = 412.14/x
  3. Step 3: Cross multiply
    721.29x = 1,081.84 × 412.14
  4. Step 4: Simplify right side
    721.29x = 445,869.54
  5. Step 5: Solve for x
    x = 445,869.54/721.29
  6. Step 6: Final answer
    x = 618.16

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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.