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Finding the Fourth Proportional to 1,080.39, 1,617.53 and 839.73

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Solution

The fourth proportional to 1,080.39, 1,617.53 and 839.73 is: 1,257.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.39 : 1,617.53 = 839.73 : x
  2. Step 2: Convert to fraction form
    1,080.39/1,617.53 = 839.73/x
  3. Step 3: Cross multiply
    1,080.39x = 1,617.53 × 839.73
  4. Step 4: Simplify right side
    1,080.39x = 1,358,284.27
  5. Step 5: Solve for x
    x = 1,358,284.27/1,080.39
  6. Step 6: Final answer
    x = 1,257.22

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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.