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Finding the Fourth Proportional to 16.91, 23.31 and 11.45

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Solution

The fourth proportional to 16.91, 23.31 and 11.45 is: 15.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.91 : 23.31 = 11.45 : x
  2. Step 2: Convert to fraction form
    16.91/23.31 = 11.45/x
  3. Step 3: Cross multiply
    16.91x = 23.31 × 11.45
  4. Step 4: Simplify right side
    16.91x = 266.78
  5. Step 5: Solve for x
    x = 266.78/16.91
  6. Step 6: Final answer
    x = 15.78

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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.