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Finding the Fourth Proportional to 1,715.92, 2,571.90 and 789.54

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Solution

The fourth proportional to 1,715.92, 2,571.90 and 789.54 is: 1,183.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,715.92 : 2,571.90 = 789.54 : x
  2. Step 2: Convert to fraction form
    1,715.92/2,571.90 = 789.54/x
  3. Step 3: Cross multiply
    1,715.92x = 2,571.90 × 789.54
  4. Step 4: Simplify right side
    1,715.92x = 2,030,601.12
  5. Step 5: Solve for x
    x = 2,030,601.12/1,715.92
  6. Step 6: Final answer
    x = 1,183.39

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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.