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Finding the Fourth Proportional to 2,159.38, 3,241.50 and 861.76

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Solution

The fourth proportional to 2,159.38, 3,241.50 and 861.76 is: 1,293.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.38 : 3,241.50 = 861.76 : x
  2. Step 2: Convert to fraction form
    2,159.38/3,241.50 = 861.76/x
  3. Step 3: Cross multiply
    2,159.38x = 3,241.50 × 861.76
  4. Step 4: Simplify right side
    2,159.38x = 2,793,395.04
  5. Step 5: Solve for x
    x = 2,793,395.04/2,159.38
  6. Step 6: Final answer
    x = 1,293.61

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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.