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Finding the Fourth Proportional to 725.03, 1,081.18 and 718.45

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Solution

The fourth proportional to 725.03, 1,081.18 and 718.45 is: 1,071.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.03 : 1,081.18 = 718.45 : x
  2. Step 2: Convert to fraction form
    725.03/1,081.18 = 718.45/x
  3. Step 3: Cross multiply
    725.03x = 1,081.18 × 718.45
  4. Step 4: Simplify right side
    725.03x = 776,778.05
  5. Step 5: Solve for x
    x = 776,778.05/725.03
  6. Step 6: Final answer
    x = 1,071.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.