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Finding the Fourth Proportional to 197.72, 272.78 and 114.80

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Solution

The fourth proportional to 197.72, 272.78 and 114.80 is: 158.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.72 : 272.78 = 114.80 : x
  2. Step 2: Convert to fraction form
    197.72/272.78 = 114.80/x
  3. Step 3: Cross multiply
    197.72x = 272.78 × 114.80
  4. Step 4: Simplify right side
    197.72x = 31,315.14
  5. Step 5: Solve for x
    x = 31,315.14/197.72
  6. Step 6: Final answer
    x = 158.38

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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.