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Finding the Fourth Proportional to 22.20, 30.55 and 21.69

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Solution

The fourth proportional to 22.20, 30.55 and 21.69 is: 29.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.20 : 30.55 = 21.69 : x
  2. Step 2: Convert to fraction form
    22.20/30.55 = 21.69/x
  3. Step 3: Cross multiply
    22.20x = 30.55 × 21.69
  4. Step 4: Simplify right side
    22.20x = 662.67
  5. Step 5: Solve for x
    x = 662.67/22.20
  6. Step 6: Final answer
    x = 29.85

Related Problems

Find fourth proportional to 11.10, 15.27 and 10.85
Half scale
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Double scale
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Similar ratio
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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.