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Finding the Fourth Proportional to 133.42, 184.05 and 86.78

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Solution

The fourth proportional to 133.42, 184.05 and 86.78 is: 119.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.42 : 184.05 = 86.78 : x
  2. Step 2: Convert to fraction form
    133.42/184.05 = 86.78/x
  3. Step 3: Cross multiply
    133.42x = 184.05 × 86.78
  4. Step 4: Simplify right side
    133.42x = 15,971.72
  5. Step 5: Solve for x
    x = 15,971.72/133.42
  6. Step 6: Final answer
    x = 119.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.