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Finding the Fourth Proportional to 1,079.96, 1,621.18 and 789.28

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Solution

The fourth proportional to 1,079.96, 1,621.18 and 789.28 is: 1,184.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.96 : 1,621.18 = 789.28 : x
  2. Step 2: Convert to fraction form
    1,079.96/1,621.18 = 789.28/x
  3. Step 3: Cross multiply
    1,079.96x = 1,621.18 × 789.28
  4. Step 4: Simplify right side
    1,079.96x = 1,279,564.95
  5. Step 5: Solve for x
    x = 1,279,564.95/1,079.96
  6. Step 6: Final answer
    x = 1,184.83

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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.