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Finding the Fourth Proportional to 1,361.89, 1,879.68 and 865.11

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Solution

The fourth proportional to 1,361.89, 1,879.68 and 865.11 is: 1,194.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.89 : 1,879.68 = 865.11 : x
  2. Step 2: Convert to fraction form
    1,361.89/1,879.68 = 865.11/x
  3. Step 3: Cross multiply
    1,361.89x = 1,879.68 × 865.11
  4. Step 4: Simplify right side
    1,361.89x = 1,626,129.96
  5. Step 5: Solve for x
    x = 1,626,129.96/1,361.89
  6. Step 6: Final answer
    x = 1,194.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.