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Finding the Fourth Proportional to 188.96, 261.09 and 136.67

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Solution

The fourth proportional to 188.96, 261.09 and 136.67 is: 188.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.96 : 261.09 = 136.67 : x
  2. Step 2: Convert to fraction form
    188.96/261.09 = 136.67/x
  3. Step 3: Cross multiply
    188.96x = 261.09 × 136.67
  4. Step 4: Simplify right side
    188.96x = 35,681.86
  5. Step 5: Solve for x
    x = 35,681.86/188.96
  6. Step 6: Final answer
    x = 188.84

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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.