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Finding the Fourth Proportional to 133.19, 199.79 and 79.05

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Solution

The fourth proportional to 133.19, 199.79 and 79.05 is: 118.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.19 : 199.79 = 79.05 : x
  2. Step 2: Convert to fraction form
    133.19/199.79 = 79.05/x
  3. Step 3: Cross multiply
    133.19x = 199.79 × 79.05
  4. Step 4: Simplify right side
    133.19x = 15,793.40
  5. Step 5: Solve for x
    x = 15,793.40/133.19
  6. Step 6: Final answer
    x = 118.58

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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.