Home / 1,405.44-2,108.28-789.12

Finding the Fourth Proportional to 1,405.44, 2,108.28 and 789.12

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Solution

The fourth proportional to 1,405.44, 2,108.28 and 789.12 is: 1,183.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.44 : 2,108.28 = 789.12 : x
  2. Step 2: Convert to fraction form
    1,405.44/2,108.28 = 789.12/x
  3. Step 3: Cross multiply
    1,405.44x = 2,108.28 × 789.12
  4. Step 4: Simplify right side
    1,405.44x = 1,663,685.91
  5. Step 5: Solve for x
    x = 1,663,685.91/1,405.44
  6. Step 6: Final answer
    x = 1,183.75

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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.