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Finding the Fourth Proportional to 689.39, 1,034.09 and 169.39

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Solution

The fourth proportional to 689.39, 1,034.09 and 169.39 is: 254.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.39 : 1,034.09 = 169.39 : x
  2. Step 2: Convert to fraction form
    689.39/1,034.09 = 169.39/x
  3. Step 3: Cross multiply
    689.39x = 1,034.09 × 169.39
  4. Step 4: Simplify right side
    689.39x = 175,164.93
  5. Step 5: Solve for x
    x = 175,164.93/689.39
  6. Step 6: Final answer
    x = 254.09

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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.