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Finding the Fourth Proportional to 1,114.68, 1,537.92 and 721.38

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Solution

The fourth proportional to 1,114.68, 1,537.92 and 721.38 is: 995.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.68 : 1,537.92 = 721.38 : x
  2. Step 2: Convert to fraction form
    1,114.68/1,537.92 = 721.38/x
  3. Step 3: Cross multiply
    1,114.68x = 1,537.92 × 721.38
  4. Step 4: Simplify right side
    1,114.68x = 1,109,424.73
  5. Step 5: Solve for x
    x = 1,109,424.73/1,114.68
  6. Step 6: Final answer
    x = 995.29

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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.