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Finding the Fourth Proportional to 134.11, 185.07 and 78.85

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Solution

The fourth proportional to 134.11, 185.07 and 78.85 is: 108.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.11 : 185.07 = 78.85 : x
  2. Step 2: Convert to fraction form
    134.11/185.07 = 78.85/x
  3. Step 3: Cross multiply
    134.11x = 185.07 × 78.85
  4. Step 4: Simplify right side
    134.11x = 14,592.85
  5. Step 5: Solve for x
    x = 14,592.85/134.11
  6. Step 6: Final answer
    x = 108.81

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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.