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Finding the Fourth Proportional to 67.23, 100.81 and 61.50

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Solution

The fourth proportional to 67.23, 100.81 and 61.50 is: 92.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.23 : 100.81 = 61.50 : x
  2. Step 2: Convert to fraction form
    67.23/100.81 = 61.50/x
  3. Step 3: Cross multiply
    67.23x = 100.81 × 61.50
  4. Step 4: Simplify right side
    67.23x = 6,199.13
  5. Step 5: Solve for x
    x = 6,199.13/67.23
  6. Step 6: Final answer
    x = 92.21

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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.