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Finding the Fourth Proportional to 20.73, 28.64 and 14.61

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Solution

The fourth proportional to 20.73, 28.64 and 14.61 is: 20.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.73 : 28.64 = 14.61 : x
  2. Step 2: Convert to fraction form
    20.73/28.64 = 14.61/x
  3. Step 3: Cross multiply
    20.73x = 28.64 × 14.61
  4. Step 4: Simplify right side
    20.73x = 418.36
  5. Step 5: Solve for x
    x = 418.36/20.73
  6. Step 6: Final answer
    x = 20.18

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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.