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Finding the Fourth Proportional to 144.10, 198.79 and 91.56

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Solution

The fourth proportional to 144.10, 198.79 and 91.56 is: 126.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.10 : 198.79 = 91.56 : x
  2. Step 2: Convert to fraction form
    144.10/198.79 = 91.56/x
  3. Step 3: Cross multiply
    144.10x = 198.79 × 91.56
  4. Step 4: Simplify right side
    144.10x = 18,201.21
  5. Step 5: Solve for x
    x = 18,201.21/144.10
  6. Step 6: Final answer
    x = 126.31

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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.