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Finding the Fourth Proportional to 1,959.40, 2,940.42 and 726.86

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Solution

The fourth proportional to 1,959.40, 2,940.42 and 726.86 is: 1,090.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.40 : 2,940.42 = 726.86 : x
  2. Step 2: Convert to fraction form
    1,959.40/2,940.42 = 726.86/x
  3. Step 3: Cross multiply
    1,959.40x = 2,940.42 × 726.86
  4. Step 4: Simplify right side
    1,959.40x = 2,137,273.68
  5. Step 5: Solve for x
    x = 2,137,273.68/1,959.40
  6. Step 6: Final answer
    x = 1,090.78

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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.