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Finding the Fourth Proportional to 981.33, 1,468.79 and 721.26

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Solution

The fourth proportional to 981.33, 1,468.79 and 721.26 is: 1,079.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.33 : 1,468.79 = 721.26 : x
  2. Step 2: Convert to fraction form
    981.33/1,468.79 = 721.26/x
  3. Step 3: Cross multiply
    981.33x = 1,468.79 × 721.26
  4. Step 4: Simplify right side
    981.33x = 1,059,382.68
  5. Step 5: Solve for x
    x = 1,059,382.68/981.33
  6. Step 6: Final answer
    x = 1,079.54

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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.