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Finding the Fourth Proportional to 1,861.15, 2,791.79 and 936.20

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Solution

The fourth proportional to 1,861.15, 2,791.79 and 936.20 is: 1,404.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.15 : 2,791.79 = 936.20 : x
  2. Step 2: Convert to fraction form
    1,861.15/2,791.79 = 936.20/x
  3. Step 3: Cross multiply
    1,861.15x = 2,791.79 × 936.20
  4. Step 4: Simplify right side
    1,861.15x = 2,613,669.12
  5. Step 5: Solve for x
    x = 2,613,669.12/1,861.15
  6. Step 6: Final answer
    x = 1,404.33

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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.