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Finding the Fourth Proportional to 231.56, 319.64 and 209.68

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Solution

The fourth proportional to 231.56, 319.64 and 209.68 is: 289.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.56 : 319.64 = 209.68 : x
  2. Step 2: Convert to fraction form
    231.56/319.64 = 209.68/x
  3. Step 3: Cross multiply
    231.56x = 319.64 × 209.68
  4. Step 4: Simplify right side
    231.56x = 67,022.12
  5. Step 5: Solve for x
    x = 67,022.12/231.56
  6. Step 6: Final answer
    x = 289.44

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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.