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Finding the Fourth Proportional to 20.40, 28.15 and 16.94

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Solution

The fourth proportional to 20.40, 28.15 and 16.94 is: 23.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.40 : 28.15 = 16.94 : x
  2. Step 2: Convert to fraction form
    20.40/28.15 = 16.94/x
  3. Step 3: Cross multiply
    20.40x = 28.15 × 16.94
  4. Step 4: Simplify right side
    20.40x = 476.89
  5. Step 5: Solve for x
    x = 476.89/20.40
  6. Step 6: Final answer
    x = 23.37

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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.