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Finding the Fourth Proportional to 2,721.81, 4,082.67 and 872.90

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Solution

The fourth proportional to 2,721.81, 4,082.67 and 872.90 is: 1,309.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,721.81 : 4,082.67 = 872.90 : x
  2. Step 2: Convert to fraction form
    2,721.81/4,082.67 = 872.90/x
  3. Step 3: Cross multiply
    2,721.81x = 4,082.67 × 872.90
  4. Step 4: Simplify right side
    2,721.81x = 3,563,742.23
  5. Step 5: Solve for x
    x = 3,563,742.23/2,721.81
  6. Step 6: Final answer
    x = 1,309.33

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1.5x scale

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.