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Finding the Fourth Proportional to 144.35, 199.21 and 78.86

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Solution

The fourth proportional to 144.35, 199.21 and 78.86 is: 108.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.35 : 199.21 = 78.86 : x
  2. Step 2: Convert to fraction form
    144.35/199.21 = 78.86/x
  3. Step 3: Cross multiply
    144.35x = 199.21 × 78.86
  4. Step 4: Simplify right side
    144.35x = 15,709.70
  5. Step 5: Solve for x
    x = 15,709.70/144.35
  6. Step 6: Final answer
    x = 108.83

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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.