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Finding the Fourth Proportional to 880.78, 1,321.18 and 231.56

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Solution

The fourth proportional to 880.78, 1,321.18 and 231.56 is: 347.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.78 : 1,321.18 = 231.56 : x
  2. Step 2: Convert to fraction form
    880.78/1,321.18 = 231.56/x
  3. Step 3: Cross multiply
    880.78x = 1,321.18 × 231.56
  4. Step 4: Simplify right side
    880.78x = 305,932.44
  5. Step 5: Solve for x
    x = 305,932.44/880.78
  6. Step 6: Final answer
    x = 347.34

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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.