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Finding the Fourth Proportional to 1,205.97, 1,665.60 and 812.31

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Solution

The fourth proportional to 1,205.97, 1,665.60 and 812.31 is: 1,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.97 : 1,665.60 = 812.31 : x
  2. Step 2: Convert to fraction form
    1,205.97/1,665.60 = 812.31/x
  3. Step 3: Cross multiply
    1,205.97x = 1,665.60 × 812.31
  4. Step 4: Simplify right side
    1,205.97x = 1,352,983.54
  5. Step 5: Solve for x
    x = 1,352,983.54/1,205.97
  6. Step 6: Final answer
    x = 1,121.90

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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.