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Finding the Fourth Proportional to 22.69, 33.85 and 21.08

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Solution

The fourth proportional to 22.69, 33.85 and 21.08 is: 31.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.69 : 33.85 = 21.08 : x
  2. Step 2: Convert to fraction form
    22.69/33.85 = 21.08/x
  3. Step 3: Cross multiply
    22.69x = 33.85 × 21.08
  4. Step 4: Simplify right side
    22.69x = 713.56
  5. Step 5: Solve for x
    x = 713.56/22.69
  6. Step 6: Final answer
    x = 31.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.