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Finding the Fourth Proportional to 133.10, 199.66 and 71.38

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Solution

The fourth proportional to 133.10, 199.66 and 71.38 is: 107.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.10 : 199.66 = 71.38 : x
  2. Step 2: Convert to fraction form
    133.10/199.66 = 71.38/x
  3. Step 3: Cross multiply
    133.10x = 199.66 × 71.38
  4. Step 4: Simplify right side
    133.10x = 14,251.19
  5. Step 5: Solve for x
    x = 14,251.19/133.10
  6. Step 6: Final answer
    x = 107.07

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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.