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Finding the Fourth Proportional to 15.99, 23.92 and 11.91

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Solution

The fourth proportional to 15.99, 23.92 and 11.91 is: 17.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.99 : 23.92 = 11.91 : x
  2. Step 2: Convert to fraction form
    15.99/23.92 = 11.91/x
  3. Step 3: Cross multiply
    15.99x = 23.92 × 11.91
  4. Step 4: Simplify right side
    15.99x = 284.89
  5. Step 5: Solve for x
    x = 284.89/15.99
  6. Step 6: Final answer
    x = 17.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.