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Finding the Fourth Proportional to 1,139.26, 1,708.68 and 398.96

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Solution

The fourth proportional to 1,139.26, 1,708.68 and 398.96 is: 598.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.26 : 1,708.68 = 398.96 : x
  2. Step 2: Convert to fraction form
    1,139.26/1,708.68 = 398.96/x
  3. Step 3: Cross multiply
    1,139.26x = 1,708.68 × 398.96
  4. Step 4: Simplify right side
    1,139.26x = 681,694.97
  5. Step 5: Solve for x
    x = 681,694.97/1,139.26
  6. Step 6: Final answer
    x = 598.37

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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.