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Finding the Fourth Proportional to 231.72, 345.90 and 212.46

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Solution

The fourth proportional to 231.72, 345.90 and 212.46 is: 317.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.72 : 345.90 = 212.46 : x
  2. Step 2: Convert to fraction form
    231.72/345.90 = 212.46/x
  3. Step 3: Cross multiply
    231.72x = 345.90 × 212.46
  4. Step 4: Simplify right side
    231.72x = 73,489.91
  5. Step 5: Solve for x
    x = 73,489.91/231.72
  6. Step 6: Final answer
    x = 317.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.