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Finding the Fourth Proportional to 144.25, 199.07 and 78.75

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Solution

The fourth proportional to 144.25, 199.07 and 78.75 is: 108.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.25 : 199.07 = 78.75 : x
  2. Step 2: Convert to fraction form
    144.25/199.07 = 78.75/x
  3. Step 3: Cross multiply
    144.25x = 199.07 × 78.75
  4. Step 4: Simplify right side
    144.25x = 15,676.76
  5. Step 5: Solve for x
    x = 15,676.76/144.25
  6. Step 6: Final answer
    x = 108.68

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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.