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Finding the Fourth Proportional to 230.61, 318.21 and 216.79

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Solution

The fourth proportional to 230.61, 318.21 and 216.79 is: 299.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.61 : 318.21 = 216.79 : x
  2. Step 2: Convert to fraction form
    230.61/318.21 = 216.79/x
  3. Step 3: Cross multiply
    230.61x = 318.21 × 216.79
  4. Step 4: Simplify right side
    230.61x = 68,983.14
  5. Step 5: Solve for x
    x = 68,983.14/230.61
  6. Step 6: Final answer
    x = 299.13

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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.