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Finding the Fourth Proportional to 213.22, 319.86 and 66.97

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Solution

The fourth proportional to 213.22, 319.86 and 66.97 is: 100.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.22 : 319.86 = 66.97 : x
  2. Step 2: Convert to fraction form
    213.22/319.86 = 66.97/x
  3. Step 3: Cross multiply
    213.22x = 319.86 × 66.97
  4. Step 4: Simplify right side
    213.22x = 21,421.02
  5. Step 5: Solve for x
    x = 21,421.02/213.22
  6. Step 6: Final answer
    x = 100.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.