Home / 1,139.13-1,708.22-408.31

Finding the Fourth Proportional to 1,139.13, 1,708.22 and 408.31

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Solution

The fourth proportional to 1,139.13, 1,708.22 and 408.31 is: 612.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.13 : 1,708.22 = 408.31 : x
  2. Step 2: Convert to fraction form
    1,139.13/1,708.22 = 408.31/x
  3. Step 3: Cross multiply
    1,139.13x = 1,708.22 × 408.31
  4. Step 4: Simplify right side
    1,139.13x = 697,480.06
  5. Step 5: Solve for x
    x = 697,480.06/1,139.13
  6. Step 6: Final answer
    x = 612.29

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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.