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Finding the Fourth Proportional to 812.28, 1,121.13 and 681.06

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Solution

The fourth proportional to 812.28, 1,121.13 and 681.06 is: 940.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.28 : 1,121.13 = 681.06 : x
  2. Step 2: Convert to fraction form
    812.28/1,121.13 = 681.06/x
  3. Step 3: Cross multiply
    812.28x = 1,121.13 × 681.06
  4. Step 4: Simplify right side
    812.28x = 763,556.80
  5. Step 5: Solve for x
    x = 763,556.80/812.28
  6. Step 6: Final answer
    x = 940.02

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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.