Home / 1,039.20-1,432.26-789.96

Finding the Fourth Proportional to 1,039.20, 1,432.26 and 789.96

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Solution

The fourth proportional to 1,039.20, 1,432.26 and 789.96 is: 1,088.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.20 : 1,432.26 = 789.96 : x
  2. Step 2: Convert to fraction form
    1,039.20/1,432.26 = 789.96/x
  3. Step 3: Cross multiply
    1,039.20x = 1,432.26 × 789.96
  4. Step 4: Simplify right side
    1,039.20x = 1,131,428.11
  5. Step 5: Solve for x
    x = 1,131,428.11/1,039.20
  6. Step 6: Final answer
    x = 1,088.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.