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Finding the Fourth Proportional to 136.32, 187.81 and 108.64

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Solution

The fourth proportional to 136.32, 187.81 and 108.64 is: 149.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.32 : 187.81 = 108.64 : x
  2. Step 2: Convert to fraction form
    136.32/187.81 = 108.64/x
  3. Step 3: Cross multiply
    136.32x = 187.81 × 108.64
  4. Step 4: Simplify right side
    136.32x = 20,403.68
  5. Step 5: Solve for x
    x = 20,403.68/136.32
  6. Step 6: Final answer
    x = 149.67

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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.