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Finding the Fourth Proportional to 231.05, 318.33 and 187.31

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Solution

The fourth proportional to 231.05, 318.33 and 187.31 is: 258.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.05 : 318.33 = 187.31 : x
  2. Step 2: Convert to fraction form
    231.05/318.33 = 187.31/x
  3. Step 3: Cross multiply
    231.05x = 318.33 × 187.31
  4. Step 4: Simplify right side
    231.05x = 59,627.19
  5. Step 5: Solve for x
    x = 59,627.19/231.05
  6. Step 6: Final answer
    x = 258.07

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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.