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Finding the Fourth Proportional to 22.51, 33.62 and 18.90

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Solution

The fourth proportional to 22.51, 33.62 and 18.90 is: 28.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.51 : 33.62 = 18.90 : x
  2. Step 2: Convert to fraction form
    22.51/33.62 = 18.90/x
  3. Step 3: Cross multiply
    22.51x = 33.62 × 18.90
  4. Step 4: Simplify right side
    22.51x = 635.32
  5. Step 5: Solve for x
    x = 635.32/22.51
  6. Step 6: Final answer
    x = 28.22

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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.