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Finding the Fourth Proportional to 727.26, 1,082.78 and 685.14

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Solution

The fourth proportional to 727.26, 1,082.78 and 685.14 is: 1,020.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.26 : 1,082.78 = 685.14 : x
  2. Step 2: Convert to fraction form
    727.26/1,082.78 = 685.14/x
  3. Step 3: Cross multiply
    727.26x = 1,082.78 × 685.14
  4. Step 4: Simplify right side
    727.26x = 741,852.46
  5. Step 5: Solve for x
    x = 741,852.46/727.26
  6. Step 6: Final answer
    x = 1,020.06

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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.