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Finding the Fourth Proportional to 2,721.55, 4,082.33 and 872.68

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Solution

The fourth proportional to 2,721.55, 4,082.33 and 872.68 is: 1,309.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,721.55 : 4,082.33 = 872.68 : x
  2. Step 2: Convert to fraction form
    2,721.55/4,082.33 = 872.68/x
  3. Step 3: Cross multiply
    2,721.55x = 4,082.33 × 872.68
  4. Step 4: Simplify right side
    2,721.55x = 3,562,567.74
  5. Step 5: Solve for x
    x = 3,562,567.74/2,721.55
  6. Step 6: Final answer
    x = 1,309.02

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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.