Home / 1,414.40-2,121.53-721.34

Finding the Fourth Proportional to 1,414.40, 2,121.53 and 721.34

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Solution

The fourth proportional to 1,414.40, 2,121.53 and 721.34 is: 1,081.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,414.40 : 2,121.53 = 721.34 : x
  2. Step 2: Convert to fraction form
    1,414.40/2,121.53 = 721.34/x
  3. Step 3: Cross multiply
    1,414.40x = 2,121.53 × 721.34
  4. Step 4: Simplify right side
    1,414.40x = 1,530,338.19
  5. Step 5: Solve for x
    x = 1,530,338.19/1,414.40
  6. Step 6: Final answer
    x = 1,081.97

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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.