Home / 1,382.12-2,073.38-408.09

Finding the Fourth Proportional to 1,382.12, 2,073.38 and 408.09

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Solution

The fourth proportional to 1,382.12, 2,073.38 and 408.09 is: 612.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.12 : 2,073.38 = 408.09 : x
  2. Step 2: Convert to fraction form
    1,382.12/2,073.38 = 408.09/x
  3. Step 3: Cross multiply
    1,382.12x = 2,073.38 × 408.09
  4. Step 4: Simplify right side
    1,382.12x = 846,123.60
  5. Step 5: Solve for x
    x = 846,123.60/1,382.12
  6. Step 6: Final answer
    x = 612.19

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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.