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Finding the Fourth Proportional to 1,151.16, 1,728.48 and 721.08

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Solution

The fourth proportional to 1,151.16, 1,728.48 and 721.08 is: 1,082.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.16 : 1,728.48 = 721.08 : x
  2. Step 2: Convert to fraction form
    1,151.16/1,728.48 = 721.08/x
  3. Step 3: Cross multiply
    1,151.16x = 1,728.48 × 721.08
  4. Step 4: Simplify right side
    1,151.16x = 1,246,372.36
  5. Step 5: Solve for x
    x = 1,246,372.36/1,151.16
  6. Step 6: Final answer
    x = 1,082.71

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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.