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Finding the Fourth Proportional to 1,239.97, 1,711.21 and 680.46

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Solution

The fourth proportional to 1,239.97, 1,711.21 and 680.46 is: 939.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.97 : 1,711.21 = 680.46 : x
  2. Step 2: Convert to fraction form
    1,239.97/1,711.21 = 680.46/x
  3. Step 3: Cross multiply
    1,239.97x = 1,711.21 × 680.46
  4. Step 4: Simplify right side
    1,239.97x = 1,164,409.73
  5. Step 5: Solve for x
    x = 1,164,409.73/1,239.97
  6. Step 6: Final answer
    x = 939.06

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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.