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Finding the Fourth Proportional to 1,279.85, 1,916.11 and 789.60

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Solution

The fourth proportional to 1,279.85, 1,916.11 and 789.60 is: 1,182.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.85 : 1,916.11 = 789.60 : x
  2. Step 2: Convert to fraction form
    1,279.85/1,916.11 = 789.60/x
  3. Step 3: Cross multiply
    1,279.85x = 1,916.11 × 789.60
  4. Step 4: Simplify right side
    1,279.85x = 1,512,953.41
  5. Step 5: Solve for x
    x = 1,512,953.41/1,279.85
  6. Step 6: Final answer
    x = 1,182.13

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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.