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Finding the Fourth Proportional to 36.46, 50.30 and 21.90

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Solution

The fourth proportional to 36.46, 50.30 and 21.90 is: 30.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.46 : 50.30 = 21.90 : x
  2. Step 2: Convert to fraction form
    36.46/50.30 = 21.90/x
  3. Step 3: Cross multiply
    36.46x = 50.30 × 21.90
  4. Step 4: Simplify right side
    36.46x = 1,101.57
  5. Step 5: Solve for x
    x = 1,101.57/36.46
  6. Step 6: Final answer
    x = 30.21

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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.