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Finding the Fourth Proportional to 133, 199.40 and 72.12

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Solution

The fourth proportional to 133, 199.40 and 72.12 is: 108.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    133 : 199.40 = 72.12 : x
  2. Step 2: Convert to fraction form
    133/199.40 = 72.12/x
  3. Step 3: Cross multiply
    133x = 199.40 × 72.12
  4. Step 4: Simplify right side
    133x = 14,380.73
  5. Step 5: Solve for x
    x = 14,380.73/133
  6. Step 6: Final answer
    x = 108.13

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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.