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Finding the Fourth Proportional to 22.15, 33.40 and 20.89

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Solution

The fourth proportional to 22.15, 33.40 and 20.89 is: 31.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.15 : 33.40 = 20.89 : x
  2. Step 2: Convert to fraction form
    22.15/33.40 = 20.89/x
  3. Step 3: Cross multiply
    22.15x = 33.40 × 20.89
  4. Step 4: Simplify right side
    22.15x = 697.45
  5. Step 5: Solve for x
    x = 697.45/22.15
  6. Step 6: Final answer
    x = 31.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.