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Finding the Fourth Proportional to 18.81, 25.91 and 15.16

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Solution

The fourth proportional to 18.81, 25.91 and 15.16 is: 20.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.81 : 25.91 = 15.16 : x
  2. Step 2: Convert to fraction form
    18.81/25.91 = 15.16/x
  3. Step 3: Cross multiply
    18.81x = 25.91 × 15.16
  4. Step 4: Simplify right side
    18.81x = 392.80
  5. Step 5: Solve for x
    x = 392.80/18.81
  6. Step 6: Final answer
    x = 20.88

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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.