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Finding the Fourth Proportional to 133.18, 199.31 and 121.52

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Solution

The fourth proportional to 133.18, 199.31 and 121.52 is: 181.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.18 : 199.31 = 121.52 : x
  2. Step 2: Convert to fraction form
    133.18/199.31 = 121.52/x
  3. Step 3: Cross multiply
    133.18x = 199.31 × 121.52
  4. Step 4: Simplify right side
    133.18x = 24,220.15
  5. Step 5: Solve for x
    x = 24,220.15/133.18
  6. Step 6: Final answer
    x = 181.86

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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.