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Finding the Fourth Proportional to 67.23, 100.81 and 21.58

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Solution

The fourth proportional to 67.23, 100.81 and 21.58 is: 32.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.23 : 100.81 = 21.58 : x
  2. Step 2: Convert to fraction form
    67.23/100.81 = 21.58/x
  3. Step 3: Cross multiply
    67.23x = 100.81 × 21.58
  4. Step 4: Simplify right side
    67.23x = 2,175.82
  5. Step 5: Solve for x
    x = 2,175.82/67.23
  6. Step 6: Final answer
    x = 32.36

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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.