Home / 1,139.24-1,708.56-408.71

Finding the Fourth Proportional to 1,139.24, 1,708.56 and 408.71

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Solution

The fourth proportional to 1,139.24, 1,708.56 and 408.71 is: 612.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.24 : 1,708.56 = 408.71 : x
  2. Step 2: Convert to fraction form
    1,139.24/1,708.56 = 408.71/x
  3. Step 3: Cross multiply
    1,139.24x = 1,708.56 × 408.71
  4. Step 4: Simplify right side
    1,139.24x = 698,305.56
  5. Step 5: Solve for x
    x = 698,305.56/1,139.24
  6. Step 6: Final answer
    x = 612.96

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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.