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Finding the Fourth Proportional to 1,249.55, 1,724.40 and 718.51

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Solution

The fourth proportional to 1,249.55, 1,724.40 and 718.51 is: 991.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.55 : 1,724.40 = 718.51 : x
  2. Step 2: Convert to fraction form
    1,249.55/1,724.40 = 718.51/x
  3. Step 3: Cross multiply
    1,249.55x = 1,724.40 × 718.51
  4. Step 4: Simplify right side
    1,249.55x = 1,238,995.05
  5. Step 5: Solve for x
    x = 1,238,995.05/1,249.55
  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.