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Finding the Fourth Proportional to 905.88, 1,361.25 and 879.15

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Solution

The fourth proportional to 905.88, 1,361.25 and 879.15 is: 1,321.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.88 : 1,361.25 = 879.15 : x
  2. Step 2: Convert to fraction form
    905.88/1,361.25 = 879.15/x
  3. Step 3: Cross multiply
    905.88x = 1,361.25 × 879.15
  4. Step 4: Simplify right side
    905.88x = 1,196,742.94
  5. Step 5: Solve for x
    x = 1,196,742.94/905.88
  6. Step 6: Final answer
    x = 1,321.08

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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.