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Finding the Fourth Proportional to 2,631.67, 3,947.55 and 683.80

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Solution

The fourth proportional to 2,631.67, 3,947.55 and 683.80 is: 1,025.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.67 : 3,947.55 = 683.80 : x
  2. Step 2: Convert to fraction form
    2,631.67/3,947.55 = 683.80/x
  3. Step 3: Cross multiply
    2,631.67x = 3,947.55 × 683.80
  4. Step 4: Simplify right side
    2,631.67x = 2,699,334.69
  5. Step 5: Solve for x
    x = 2,699,334.69/2,631.67
  6. Step 6: Final answer
    x = 1,025.71

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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.