Home / 1,338.10-2,006.22-721.18

Finding the Fourth Proportional to 1,338.10, 2,006.22 and 721.18

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Solution

The fourth proportional to 1,338.10, 2,006.22 and 721.18 is: 1,081.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.10 : 2,006.22 = 721.18 : x
  2. Step 2: Convert to fraction form
    1,338.10/2,006.22 = 721.18/x
  3. Step 3: Cross multiply
    1,338.10x = 2,006.22 × 721.18
  4. Step 4: Simplify right side
    1,338.10x = 1,446,845.74
  5. Step 5: Solve for x
    x = 1,446,845.74/1,338.10
  6. Step 6: Final answer
    x = 1,081.27

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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.