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Finding the Fourth Proportional to 67.21, 100.82 and 66.07

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Solution

The fourth proportional to 67.21, 100.82 and 66.07 is: 99.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.21 : 100.82 = 66.07 : x
  2. Step 2: Convert to fraction form
    67.21/100.82 = 66.07/x
  3. Step 3: Cross multiply
    67.21x = 100.82 × 66.07
  4. Step 4: Simplify right side
    67.21x = 6,660.34
  5. Step 5: Solve for x
    x = 6,660.34/67.21
  6. Step 6: Final answer
    x = 99.10

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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.