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Finding the Fourth Proportional to 73.20, 109.81 and 21.85

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Solution

The fourth proportional to 73.20, 109.81 and 21.85 is: 32.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.20 : 109.81 = 21.85 : x
  2. Step 2: Convert to fraction form
    73.20/109.81 = 21.85/x
  3. Step 3: Cross multiply
    73.20x = 109.81 × 21.85
  4. Step 4: Simplify right side
    73.20x = 2,398.83
  5. Step 5: Solve for x
    x = 2,398.83/73.20
  6. Step 6: Final answer
    x = 32.77

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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.