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Finding the Fourth Proportional to 812.31, 1,121.04 and 517.65

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Solution

The fourth proportional to 812.31, 1,121.04 and 517.65 is: 714.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.31 : 1,121.04 = 517.65 : x
  2. Step 2: Convert to fraction form
    812.31/1,121.04 = 517.65/x
  3. Step 3: Cross multiply
    812.31x = 1,121.04 × 517.65
  4. Step 4: Simplify right side
    812.31x = 580,306.36
  5. Step 5: Solve for x
    x = 580,306.36/812.31
  6. Step 6: Final answer
    x = 714.39

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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.