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Finding the Fourth Proportional to 133.01, 199.55 and 91.78

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Solution

The fourth proportional to 133.01, 199.55 and 91.78 is: 137.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.01 : 199.55 = 91.78 : x
  2. Step 2: Convert to fraction form
    133.01/199.55 = 91.78/x
  3. Step 3: Cross multiply
    133.01x = 199.55 × 91.78
  4. Step 4: Simplify right side
    133.01x = 18,314.43
  5. Step 5: Solve for x
    x = 18,314.43/133.01
  6. Step 6: Final answer
    x = 137.69

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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.