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Finding the Fourth Proportional to 36.87, 55.31 and 21.66

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Solution

The fourth proportional to 36.87, 55.31 and 21.66 is: 32.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.87 : 55.31 = 21.66 : x
  2. Step 2: Convert to fraction form
    36.87/55.31 = 21.66/x
  3. Step 3: Cross multiply
    36.87x = 55.31 × 21.66
  4. Step 4: Simplify right side
    36.87x = 1,198.01
  5. Step 5: Solve for x
    x = 1,198.01/36.87
  6. Step 6: Final answer
    x = 32.49

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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.