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Finding the Fourth Proportional to 73.86, 110.84 and 28.21

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Solution

The fourth proportional to 73.86, 110.84 and 28.21 is: 42.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.86 : 110.84 = 28.21 : x
  2. Step 2: Convert to fraction form
    73.86/110.84 = 28.21/x
  3. Step 3: Cross multiply
    73.86x = 110.84 × 28.21
  4. Step 4: Simplify right side
    73.86x = 3,126.80
  5. Step 5: Solve for x
    x = 3,126.80/73.86
  6. Step 6: Final answer
    x = 42.33

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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.