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Finding the Fourth Proportional to 939.43, 1,297.65 and 721.08

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Solution

The fourth proportional to 939.43, 1,297.65 and 721.08 is: 996.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.43 : 1,297.65 = 721.08 : x
  2. Step 2: Convert to fraction form
    939.43/1,297.65 = 721.08/x
  3. Step 3: Cross multiply
    939.43x = 1,297.65 × 721.08
  4. Step 4: Simplify right side
    939.43x = 935,712.17
  5. Step 5: Solve for x
    x = 935,712.17/939.43
  6. Step 6: Final answer
    x = 996.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.