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Finding the Fourth Proportional to 144.40, 199.26 and 81.38

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Solution

The fourth proportional to 144.40, 199.26 and 81.38 is: 112.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.40 : 199.26 = 81.38 : x
  2. Step 2: Convert to fraction form
    144.40/199.26 = 81.38/x
  3. Step 3: Cross multiply
    144.40x = 199.26 × 81.38
  4. Step 4: Simplify right side
    144.40x = 16,215.22
  5. Step 5: Solve for x
    x = 16,215.22/144.40
  6. Step 6: Final answer
    x = 112.30

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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.