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Finding the Fourth Proportional to 231.06, 345.96 and 212.70

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Solution

The fourth proportional to 231.06, 345.96 and 212.70 is: 318.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.06 : 345.96 = 212.70 : x
  2. Step 2: Convert to fraction form
    231.06/345.96 = 212.70/x
  3. Step 3: Cross multiply
    231.06x = 345.96 × 212.70
  4. Step 4: Simplify right side
    231.06x = 73,585.69
  5. Step 5: Solve for x
    x = 73,585.69/231.06
  6. Step 6: Final answer
    x = 318.47

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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.