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Finding the Fourth Proportional to 212.72, 318.34 and 135.73

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Solution

The fourth proportional to 212.72, 318.34 and 135.73 is: 203.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.72 : 318.34 = 135.73 : x
  2. Step 2: Convert to fraction form
    212.72/318.34 = 135.73/x
  3. Step 3: Cross multiply
    212.72x = 318.34 × 135.73
  4. Step 4: Simplify right side
    212.72x = 43,206.02
  5. Step 5: Solve for x
    x = 43,206.02/212.72
  6. Step 6: Final answer
    x = 203.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.