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Finding the Fourth Proportional to 67.21, 100.86 and 36.79

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Solution

The fourth proportional to 67.21, 100.86 and 36.79 is: 55.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.21 : 100.86 = 36.79 : x
  2. Step 2: Convert to fraction form
    67.21/100.86 = 36.79/x
  3. Step 3: Cross multiply
    67.21x = 100.86 × 36.79
  4. Step 4: Simplify right side
    67.21x = 3,710.64
  5. Step 5: Solve for x
    x = 3,710.64/67.21
  6. Step 6: Final answer
    x = 55.21

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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.