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Finding the Fourth Proportional to 36.63, 50.54 and 21.87

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Solution

The fourth proportional to 36.63, 50.54 and 21.87 is: 30.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.63 : 50.54 = 21.87 : x
  2. Step 2: Convert to fraction form
    36.63/50.54 = 21.87/x
  3. Step 3: Cross multiply
    36.63x = 50.54 × 21.87
  4. Step 4: Simplify right side
    36.63x = 1,105.20
  5. Step 5: Solve for x
    x = 1,105.20/36.63
  6. Step 6: Final answer
    x = 30.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.