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Finding the Fourth Proportional to 135.36, 186.78 and 77.12

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Solution

The fourth proportional to 135.36, 186.78 and 77.12 is: 106.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.36 : 186.78 = 77.12 : x
  2. Step 2: Convert to fraction form
    135.36/186.78 = 77.12/x
  3. Step 3: Cross multiply
    135.36x = 186.78 × 77.12
  4. Step 4: Simplify right side
    135.36x = 14,404.47
  5. Step 5: Solve for x
    x = 14,404.47/135.36
  6. Step 6: Final answer
    x = 106.42

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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.