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Finding the Fourth Proportional to 231.03, 318.66 and 216.87

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Solution

The fourth proportional to 231.03, 318.66 and 216.87 is: 299.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.03 : 318.66 = 216.87 : x
  2. Step 2: Convert to fraction form
    231.03/318.66 = 216.87/x
  3. Step 3: Cross multiply
    231.03x = 318.66 × 216.87
  4. Step 4: Simplify right side
    231.03x = 69,107.79
  5. Step 5: Solve for x
    x = 69,107.79/231.03
  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.