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Finding the Fourth Proportional to 1,959.76, 2,939.75 and 789.58

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Solution

The fourth proportional to 1,959.76, 2,939.75 and 789.58 is: 1,184.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.76 : 2,939.75 = 789.58 : x
  2. Step 2: Convert to fraction form
    1,959.76/2,939.75 = 789.58/x
  3. Step 3: Cross multiply
    1,959.76x = 2,939.75 × 789.58
  4. Step 4: Simplify right side
    1,959.76x = 2,321,167.81
  5. Step 5: Solve for x
    x = 2,321,167.81/1,959.76
  6. Step 6: Final answer
    x = 1,184.41

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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.