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Finding the Fourth Proportional to 812.64, 1,121.49 and 613.11

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Solution

The fourth proportional to 812.64, 1,121.49 and 613.11 is: 846.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.64 : 1,121.49 = 613.11 : x
  2. Step 2: Convert to fraction form
    812.64/1,121.49 = 613.11/x
  3. Step 3: Cross multiply
    812.64x = 1,121.49 × 613.11
  4. Step 4: Simplify right side
    812.64x = 687,596.73
  5. Step 5: Solve for x
    x = 687,596.73/812.64
  6. Step 6: Final answer
    x = 846.13

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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.