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Finding the Fourth Proportional to 22.20, 30.62 and 21.39

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Solution

The fourth proportional to 22.20, 30.62 and 21.39 is: 29.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.20 : 30.62 = 21.39 : x
  2. Step 2: Convert to fraction form
    22.20/30.62 = 21.39/x
  3. Step 3: Cross multiply
    22.20x = 30.62 × 21.39
  4. Step 4: Simplify right side
    22.20x = 654.96
  5. Step 5: Solve for x
    x = 654.96/22.20
  6. Step 6: Final answer
    x = 29.50

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1.5x scale

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.