Home / 1,587.06-2,381.23-721.78

Finding the Fourth Proportional to 1,587.06, 2,381.23 and 721.78

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Solution

The fourth proportional to 1,587.06, 2,381.23 and 721.78 is: 1,082.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.06 : 2,381.23 = 721.78 : x
  2. Step 2: Convert to fraction form
    1,587.06/2,381.23 = 721.78/x
  3. Step 3: Cross multiply
    1,587.06x = 2,381.23 × 721.78
  4. Step 4: Simplify right side
    1,587.06x = 1,718,724.19
  5. Step 5: Solve for x
    x = 1,718,724.19/1,587.06
  6. Step 6: Final answer
    x = 1,082.96

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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.