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Finding the Fourth Proportional to 22, 30.50 and 21.90

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Solution

The fourth proportional to 22, 30.50 and 21.90 is: 30.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    22 : 30.50 = 21.90 : x
  2. Step 2: Convert to fraction form
    22/30.50 = 21.90/x
  3. Step 3: Cross multiply
    22x = 30.50 × 21.90
  4. Step 4: Simplify right side
    22x = 667.95
  5. Step 5: Solve for x
    x = 667.95/22
  6. Step 6: Final answer
    x = 30.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.