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Finding the Fourth Proportional to 812.78, 1,219.38 and 235.66

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Solution

The fourth proportional to 812.78, 1,219.38 and 235.66 is: 353.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.78 : 1,219.38 = 235.66 : x
  2. Step 2: Convert to fraction form
    812.78/1,219.38 = 235.66/x
  3. Step 3: Cross multiply
    812.78x = 1,219.38 × 235.66
  4. Step 4: Simplify right side
    812.78x = 287,359.09
  5. Step 5: Solve for x
    x = 287,359.09/812.78
  6. Step 6: Final answer
    x = 353.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.