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Finding the Fourth Proportional to 231.11, 318.49 and 165.50

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Solution

The fourth proportional to 231.11, 318.49 and 165.50 is: 228.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.11 : 318.49 = 165.50 : x
  2. Step 2: Convert to fraction form
    231.11/318.49 = 165.50/x
  3. Step 3: Cross multiply
    231.11x = 318.49 × 165.50
  4. Step 4: Simplify right side
    231.11x = 52,708.09
  5. Step 5: Solve for x
    x = 52,708.09/231.11
  6. Step 6: Final answer
    x = 228.07

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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.