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Finding the Fourth Proportional to 73.85, 110.79 and 28.20

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Solution

The fourth proportional to 73.85, 110.79 and 28.20 is: 42.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.85 : 110.79 = 28.20 : x
  2. Step 2: Convert to fraction form
    73.85/110.79 = 28.20/x
  3. Step 3: Cross multiply
    73.85x = 110.79 × 28.20
  4. Step 4: Simplify right side
    73.85x = 3,124.28
  5. Step 5: Solve for x
    x = 3,124.28/73.85
  6. Step 6: Final answer
    x = 42.31

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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.