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Finding the Fourth Proportional to 212.87, 319.84 and 135.87

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Solution

The fourth proportional to 212.87, 319.84 and 135.87 is: 204.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.87 : 319.84 = 135.87 : x
  2. Step 2: Convert to fraction form
    212.87/319.84 = 135.87/x
  3. Step 3: Cross multiply
    212.87x = 319.84 × 135.87
  4. Step 4: Simplify right side
    212.87x = 43,456.66
  5. Step 5: Solve for x
    x = 43,456.66/212.87
  6. Step 6: Final answer
    x = 204.15

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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.