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Finding the Fourth Proportional to 1,959.35, 2,939.20 and 789.31

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Solution

The fourth proportional to 1,959.35, 2,939.20 and 789.31 is: 1,184.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.35 : 2,939.20 = 789.31 : x
  2. Step 2: Convert to fraction form
    1,959.35/2,939.20 = 789.31/x
  3. Step 3: Cross multiply
    1,959.35x = 2,939.20 × 789.31
  4. Step 4: Simplify right side
    1,959.35x = 2,319,930.63
  5. Step 5: Solve for x
    x = 2,319,930.63/1,959.35
  6. Step 6: Final answer
    x = 1,184.03

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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.