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Finding the Fourth Proportional to 230.72, 318.16 and 143.36

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Solution

The fourth proportional to 230.72, 318.16 and 143.36 is: 197.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.72 : 318.16 = 143.36 : x
  2. Step 2: Convert to fraction form
    230.72/318.16 = 143.36/x
  3. Step 3: Cross multiply
    230.72x = 318.16 × 143.36
  4. Step 4: Simplify right side
    230.72x = 45,611.42
  5. Step 5: Solve for x
    x = 45,611.42/230.72
  6. Step 6: Final answer
    x = 197.69

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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.