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Finding the Fourth Proportional to 721.72, 1,082.60 and 288.88

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Solution

The fourth proportional to 721.72, 1,082.60 and 288.88 is: 433.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.72 : 1,082.60 = 288.88 : x
  2. Step 2: Convert to fraction form
    721.72/1,082.60 = 288.88/x
  3. Step 3: Cross multiply
    721.72x = 1,082.60 × 288.88
  4. Step 4: Simplify right side
    721.72x = 312,741.49
  5. Step 5: Solve for x
    x = 312,741.49/721.72
  6. Step 6: Final answer
    x = 433.33

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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.