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Finding the Fourth Proportional to 131.68, 197.24 and 121.60

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Solution

The fourth proportional to 131.68, 197.24 and 121.60 is: 182.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.68 : 197.24 = 121.60 : x
  2. Step 2: Convert to fraction form
    131.68/197.24 = 121.60/x
  3. Step 3: Cross multiply
    131.68x = 197.24 × 121.60
  4. Step 4: Simplify right side
    131.68x = 23,984.38
  5. Step 5: Solve for x
    x = 23,984.38/131.68
  6. Step 6: Final answer
    x = 182.14

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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.