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Finding the Fourth Proportional to 223.38, 308.21 and 136.05

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Solution

The fourth proportional to 223.38, 308.21 and 136.05 is: 187.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.38 : 308.21 = 136.05 : x
  2. Step 2: Convert to fraction form
    223.38/308.21 = 136.05/x
  3. Step 3: Cross multiply
    223.38x = 308.21 × 136.05
  4. Step 4: Simplify right side
    223.38x = 41,931.29
  5. Step 5: Solve for x
    x = 41,931.29/223.38
  6. Step 6: Final answer
    x = 187.71

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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.