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Finding the Fourth Proportional to 36.75, 50.71 and 21.21

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Solution

The fourth proportional to 36.75, 50.71 and 21.21 is: 29.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.75 : 50.71 = 21.21 : x
  2. Step 2: Convert to fraction form
    36.75/50.71 = 21.21/x
  3. Step 3: Cross multiply
    36.75x = 50.71 × 21.21
  4. Step 4: Simplify right side
    36.75x = 1,075.56
  5. Step 5: Solve for x
    x = 1,075.56/36.75
  6. Step 6: Final answer
    x = 29.27

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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.