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Finding the Fourth Proportional to 1,253.13, 1,729.24 and 721.90

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Solution

The fourth proportional to 1,253.13, 1,729.24 and 721.90 is: 996.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.13 : 1,729.24 = 721.90 : x
  2. Step 2: Convert to fraction form
    1,253.13/1,729.24 = 721.90/x
  3. Step 3: Cross multiply
    1,253.13x = 1,729.24 × 721.90
  4. Step 4: Simplify right side
    1,253.13x = 1,248,338.36
  5. Step 5: Solve for x
    x = 1,248,338.36/1,253.13
  6. Step 6: Final answer
    x = 996.18

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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.