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Finding the Fourth Proportional to 213.71, 318.89 and 211.64

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Solution

The fourth proportional to 213.71, 318.89 and 211.64 is: 315.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.71 : 318.89 = 211.64 : x
  2. Step 2: Convert to fraction form
    213.71/318.89 = 211.64/x
  3. Step 3: Cross multiply
    213.71x = 318.89 × 211.64
  4. Step 4: Simplify right side
    213.71x = 67,489.62
  5. Step 5: Solve for x
    x = 67,489.62/213.71
  6. Step 6: Final answer
    x = 315.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.