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Finding the Fourth Proportional to 136.07, 187.74 and 77.85

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Solution

The fourth proportional to 136.07, 187.74 and 77.85 is: 107.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.07 : 187.74 = 77.85 : x
  2. Step 2: Convert to fraction form
    136.07/187.74 = 77.85/x
  3. Step 3: Cross multiply
    136.07x = 187.74 × 77.85
  4. Step 4: Simplify right side
    136.07x = 14,615.56
  5. Step 5: Solve for x
    x = 14,615.56/136.07
  6. Step 6: Final answer
    x = 107.42

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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.