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Finding the Fourth Proportional to 71.22, 106.68 and 66.97

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Solution

The fourth proportional to 71.22, 106.68 and 66.97 is: 100.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.22 : 106.68 = 66.97 : x
  2. Step 2: Convert to fraction form
    71.22/106.68 = 66.97/x
  3. Step 3: Cross multiply
    71.22x = 106.68 × 66.97
  4. Step 4: Simplify right side
    71.22x = 7,144.36
  5. Step 5: Solve for x
    x = 7,144.36/71.22
  6. Step 6: Final answer
    x = 100.31

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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.