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Finding the Fourth Proportional to 135.15, 186.42 and 85.92

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Solution

The fourth proportional to 135.15, 186.42 and 85.92 is: 118.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.15 : 186.42 = 85.92 : x
  2. Step 2: Convert to fraction form
    135.15/186.42 = 85.92/x
  3. Step 3: Cross multiply
    135.15x = 186.42 × 85.92
  4. Step 4: Simplify right side
    135.15x = 16,017.21
  5. Step 5: Solve for x
    x = 16,017.21/135.15
  6. Step 6: Final answer
    x = 118.51

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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.