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Finding the Fourth Proportional to 913.44, 1,369.44 and 721.92

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Solution

The fourth proportional to 913.44, 1,369.44 and 721.92 is: 1,082.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.44 : 1,369.44 = 721.92 : x
  2. Step 2: Convert to fraction form
    913.44/1,369.44 = 721.92/x
  3. Step 3: Cross multiply
    913.44x = 1,369.44 × 721.92
  4. Step 4: Simplify right side
    913.44x = 988,626.12
  5. Step 5: Solve for x
    x = 988,626.12/913.44
  6. Step 6: Final answer
    x = 1,082.31

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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.