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Finding the Fourth Proportional to 212.91, 319.24 and 187.28

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Solution

The fourth proportional to 212.91, 319.24 and 187.28 is: 280.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.91 : 319.24 = 187.28 : x
  2. Step 2: Convert to fraction form
    212.91/319.24 = 187.28/x
  3. Step 3: Cross multiply
    212.91x = 319.24 × 187.28
  4. Step 4: Simplify right side
    212.91x = 59,786.33
  5. Step 5: Solve for x
    x = 59,786.33/212.91
  6. Step 6: Final answer
    x = 280.81

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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.