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Finding the Fourth Proportional to 1,249.50, 1,724.10 and 718.29

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Solution

The fourth proportional to 1,249.50, 1,724.10 and 718.29 is: 991.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.50 : 1,724.10 = 718.29 : x
  2. Step 2: Convert to fraction form
    1,249.50/1,724.10 = 718.29/x
  3. Step 3: Cross multiply
    1,249.50x = 1,724.10 × 718.29
  4. Step 4: Simplify right side
    1,249.50x = 1,238,403.79
  5. Step 5: Solve for x
    x = 1,238,403.79/1,249.50
  6. Step 6: Final answer
    x = 991.12

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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.