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Finding the Fourth Proportional to 212.91, 319.24 and 135.85

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Solution

The fourth proportional to 212.91, 319.24 and 135.85 is: 203.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.91 : 319.24 = 135.85 : x
  2. Step 2: Convert to fraction form
    212.91/319.24 = 135.85/x
  3. Step 3: Cross multiply
    212.91x = 319.24 × 135.85
  4. Step 4: Simplify right side
    212.91x = 43,368.75
  5. Step 5: Solve for x
    x = 43,368.75/212.91
  6. Step 6: Final answer
    x = 203.70

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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.