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Finding the Fourth Proportional to 231.27, 318.78 and 156.56

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Solution

The fourth proportional to 231.27, 318.78 and 156.56 is: 215.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.27 : 318.78 = 156.56 : x
  2. Step 2: Convert to fraction form
    231.27/318.78 = 156.56/x
  3. Step 3: Cross multiply
    231.27x = 318.78 × 156.56
  4. Step 4: Simplify right side
    231.27x = 49,906.51
  5. Step 5: Solve for x
    x = 49,906.51/231.27
  6. Step 6: Final answer
    x = 215.80

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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.