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Finding the Fourth Proportional to 16.97, 23.40 and 15.15

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Solution

The fourth proportional to 16.97, 23.40 and 15.15 is: 20.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.97 : 23.40 = 15.15 : x
  2. Step 2: Convert to fraction form
    16.97/23.40 = 15.15/x
  3. Step 3: Cross multiply
    16.97x = 23.40 × 15.15
  4. Step 4: Simplify right side
    16.97x = 354.51
  5. Step 5: Solve for x
    x = 354.51/16.97
  6. Step 6: Final answer
    x = 20.90

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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.