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Finding the Fourth Proportional to 1,240.36, 1,711.75 and 680.86

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Solution

The fourth proportional to 1,240.36, 1,711.75 and 680.86 is: 939.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.36 : 1,711.75 = 680.86 : x
  2. Step 2: Convert to fraction form
    1,240.36/1,711.75 = 680.86/x
  3. Step 3: Cross multiply
    1,240.36x = 1,711.75 × 680.86
  4. Step 4: Simplify right side
    1,240.36x = 1,165,451.84
  5. Step 5: Solve for x
    x = 1,165,451.84/1,240.36
  6. Step 6: Final answer
    x = 939.61

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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.