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Finding the Fourth Proportional to 824.60, 1,236.90 and 789.05

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Solution

The fourth proportional to 824.60, 1,236.90 and 789.05 is: 1,183.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.60 : 1,236.90 = 789.05 : x
  2. Step 2: Convert to fraction form
    824.60/1,236.90 = 789.05/x
  3. Step 3: Cross multiply
    824.60x = 1,236.90 × 789.05
  4. Step 4: Simplify right side
    824.60x = 975,975.95
  5. Step 5: Solve for x
    x = 975,975.95/824.60
  6. Step 6: Final answer
    x = 1,183.58

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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.