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Finding the Fourth Proportional to 230.81, 318.44 and 142.30

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Solution

The fourth proportional to 230.81, 318.44 and 142.30 is: 196.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.81 : 318.44 = 142.30 : x
  2. Step 2: Convert to fraction form
    230.81/318.44 = 142.30/x
  3. Step 3: Cross multiply
    230.81x = 318.44 × 142.30
  4. Step 4: Simplify right side
    230.81x = 45,313.57
  5. Step 5: Solve for x
    x = 45,313.57/230.81
  6. Step 6: Final answer
    x = 196.33

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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.