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Finding the Fourth Proportional to 144.56, 199.20 and 111.68

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Solution

The fourth proportional to 144.56, 199.20 and 111.68 is: 153.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.56 : 199.20 = 111.68 : x
  2. Step 2: Convert to fraction form
    144.56/199.20 = 111.68/x
  3. Step 3: Cross multiply
    144.56x = 199.20 × 111.68
  4. Step 4: Simplify right side
    144.56x = 22,246.66
  5. Step 5: Solve for x
    x = 22,246.66/144.56
  6. Step 6: Final answer
    x = 153.89

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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.