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Finding the Fourth Proportional to 144.45, 199.26 and 85.42

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Solution

The fourth proportional to 144.45, 199.26 and 85.42 is: 117.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.45 : 199.26 = 85.42 : x
  2. Step 2: Convert to fraction form
    144.45/199.26 = 85.42/x
  3. Step 3: Cross multiply
    144.45x = 199.26 × 85.42
  4. Step 4: Simplify right side
    144.45x = 17,021.04
  5. Step 5: Solve for x
    x = 17,021.04/144.45
  6. Step 6: Final answer
    x = 117.83

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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.