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Finding the Fourth Proportional to 230.75, 318.38 and 199.90

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Solution

The fourth proportional to 230.75, 318.38 and 199.90 is: 275.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.75 : 318.38 = 199.90 : x
  2. Step 2: Convert to fraction form
    230.75/318.38 = 199.90/x
  3. Step 3: Cross multiply
    230.75x = 318.38 × 199.90
  4. Step 4: Simplify right side
    230.75x = 63,642.37
  5. Step 5: Solve for x
    x = 63,642.37/230.75
  6. Step 6: Final answer
    x = 275.81

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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.