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Finding the Fourth Proportional to 213.72, 294.96 and 136.20

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Solution

The fourth proportional to 213.72, 294.96 and 136.20 is: 187.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.72 : 294.96 = 136.20 : x
  2. Step 2: Convert to fraction form
    213.72/294.96 = 136.20/x
  3. Step 3: Cross multiply
    213.72x = 294.96 × 136.20
  4. Step 4: Simplify right side
    213.72x = 40,173.55
  5. Step 5: Solve for x
    x = 40,173.55/213.72
  6. Step 6: Final answer
    x = 187.97

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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.