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Finding the Fourth Proportional to 1,249.66, 1,724.43 and 718.56

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Solution

The fourth proportional to 1,249.66, 1,724.43 and 718.56 is: 991.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.66 : 1,724.43 = 718.56 : x
  2. Step 2: Convert to fraction form
    1,249.66/1,724.43 = 718.56/x
  3. Step 3: Cross multiply
    1,249.66x = 1,724.43 × 718.56
  4. Step 4: Simplify right side
    1,249.66x = 1,239,106.42
  5. Step 5: Solve for x
    x = 1,239,106.42/1,249.66
  6. Step 6: Final answer
    x = 991.55

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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.