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Finding the Fourth Proportional to 1,240.31, 1,711.65 and 680.83

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Solution

The fourth proportional to 1,240.31, 1,711.65 and 680.83 is: 939.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.31 : 1,711.65 = 680.83 : x
  2. Step 2: Convert to fraction form
    1,240.31/1,711.65 = 680.83/x
  3. Step 3: Cross multiply
    1,240.31x = 1,711.65 × 680.83
  4. Step 4: Simplify right side
    1,240.31x = 1,165,343.53
  5. Step 5: Solve for x
    x = 1,165,343.53/1,240.31
  6. Step 6: Final answer
    x = 939.56

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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.