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Finding the Fourth Proportional to 1,249.33, 1,724.05 and 689.80

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Solution

The fourth proportional to 1,249.33, 1,724.05 and 689.80 is: 951.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.33 : 1,724.05 = 689.80 : x
  2. Step 2: Convert to fraction form
    1,249.33/1,724.05 = 689.80/x
  3. Step 3: Cross multiply
    1,249.33x = 1,724.05 × 689.80
  4. Step 4: Simplify right side
    1,249.33x = 1,189,241.07
  5. Step 5: Solve for x
    x = 1,189,241.07/1,249.33
  6. Step 6: Final answer
    x = 951.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.