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Finding the Fourth Proportional to 1,959.95, 2,939.27 and 789.65

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Solution

The fourth proportional to 1,959.95, 2,939.27 and 789.65 is: 1,184.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.95 : 2,939.27 = 789.65 : x
  2. Step 2: Convert to fraction form
    1,959.95/2,939.27 = 789.65/x
  3. Step 3: Cross multiply
    1,959.95x = 2,939.27 × 789.65
  4. Step 4: Simplify right side
    1,959.95x = 2,320,975.91
  5. Step 5: Solve for x
    x = 2,320,975.91/1,959.95
  6. Step 6: Final answer
    x = 1,184.20

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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.