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Finding the Fourth Proportional to 231.20, 318.96 and 153.44

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Solution

The fourth proportional to 231.20, 318.96 and 153.44 is: 211.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.20 : 318.96 = 153.44 : x
  2. Step 2: Convert to fraction form
    231.20/318.96 = 153.44/x
  3. Step 3: Cross multiply
    231.20x = 318.96 × 153.44
  4. Step 4: Simplify right side
    231.20x = 48,941.22
  5. Step 5: Solve for x
    x = 48,941.22/231.20
  6. Step 6: Final answer
    x = 211.68

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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.