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Finding the Fourth Proportional to 231.12, 318.94 and 165.72

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Solution

The fourth proportional to 231.12, 318.94 and 165.72 is: 228.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.12 : 318.94 = 165.72 : x
  2. Step 2: Convert to fraction form
    231.12/318.94 = 165.72/x
  3. Step 3: Cross multiply
    231.12x = 318.94 × 165.72
  4. Step 4: Simplify right side
    231.12x = 52,854.74
  5. Step 5: Solve for x
    x = 52,854.74/231.12
  6. Step 6: Final answer
    x = 228.69

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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.