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Finding the Fourth Proportional to 1,959, 2,938.61 and 789.09

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Solution

The fourth proportional to 1,959, 2,938.61 and 789.09 is: 1,183.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959 : 2,938.61 = 789.09 : x
  2. Step 2: Convert to fraction form
    1,959/2,938.61 = 789.09/x
  3. Step 3: Cross multiply
    1,959x = 2,938.61 × 789.09
  4. Step 4: Simplify right side
    1,959x = 2,318,827.76
  5. Step 5: Solve for x
    x = 2,318,827.76/1,959
  6. Step 6: Final answer
    x = 1,183.68

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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.