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Finding the Fourth Proportional to 812.71, 1,214.20 and 674.65

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Solution

The fourth proportional to 812.71, 1,214.20 and 674.65 is: 1,007.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.71 : 1,214.20 = 674.65 : x
  2. Step 2: Convert to fraction form
    812.71/1,214.20 = 674.65/x
  3. Step 3: Cross multiply
    812.71x = 1,214.20 × 674.65
  4. Step 4: Simplify right side
    812.71x = 819,160.03
  5. Step 5: Solve for x
    x = 819,160.03/812.71
  6. Step 6: Final answer
    x = 1,007.94

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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.