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Finding the Fourth Proportional to 231.30, 319.37 and 212.81

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Solution

The fourth proportional to 231.30, 319.37 and 212.81 is: 293.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.30 : 319.37 = 212.81 : x
  2. Step 2: Convert to fraction form
    231.30/319.37 = 212.81/x
  3. Step 3: Cross multiply
    231.30x = 319.37 × 212.81
  4. Step 4: Simplify right side
    231.30x = 67,962.47
  5. Step 5: Solve for x
    x = 67,962.47/231.30
  6. Step 6: Final answer
    x = 293.83

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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.