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Finding the Fourth Proportional to 1,249.28, 1,723.99 and 689.77

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Solution

The fourth proportional to 1,249.28, 1,723.99 and 689.77 is: 951.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.28 : 1,723.99 = 689.77 : x
  2. Step 2: Convert to fraction form
    1,249.28/1,723.99 = 689.77/x
  3. Step 3: Cross multiply
    1,249.28x = 1,723.99 × 689.77
  4. Step 4: Simplify right side
    1,249.28x = 1,189,156.58
  5. Step 5: Solve for x
    x = 1,189,156.58/1,249.28
  6. Step 6: Final answer
    x = 951.88

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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.