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Finding the Fourth Proportional to 2,167.34, 3,251.05 and 780.78

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Solution

The fourth proportional to 2,167.34, 3,251.05 and 780.78 is: 1,171.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,167.34 : 3,251.05 = 780.78 : x
  2. Step 2: Convert to fraction form
    2,167.34/3,251.05 = 780.78/x
  3. Step 3: Cross multiply
    2,167.34x = 3,251.05 × 780.78
  4. Step 4: Simplify right side
    2,167.34x = 2,538,352.87
  5. Step 5: Solve for x
    x = 2,538,352.87/2,167.34
  6. Step 6: Final answer
    x = 1,171.19

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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.