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Finding the Fourth Proportional to 197.81, 296.64 and 76.11

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Solution

The fourth proportional to 197.81, 296.64 and 76.11 is: 114.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.81 : 296.64 = 76.11 : x
  2. Step 2: Convert to fraction form
    197.81/296.64 = 76.11/x
  3. Step 3: Cross multiply
    197.81x = 296.64 × 76.11
  4. Step 4: Simplify right side
    197.81x = 22,577.27
  5. Step 5: Solve for x
    x = 22,577.27/197.81
  6. Step 6: Final answer
    x = 114.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.