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Finding the Fourth Proportional to 16.51, 22.66 and 15.21

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Solution

The fourth proportional to 16.51, 22.66 and 15.21 is: 20.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.51 : 22.66 = 15.21 : x
  2. Step 2: Convert to fraction form
    16.51/22.66 = 15.21/x
  3. Step 3: Cross multiply
    16.51x = 22.66 × 15.21
  4. Step 4: Simplify right side
    16.51x = 344.66
  5. Step 5: Solve for x
    x = 344.66/16.51
  6. Step 6: Final answer
    x = 20.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.