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Finding the Fourth Proportional to 18.31, 25.25 and 15.68

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Solution

The fourth proportional to 18.31, 25.25 and 15.68 is: 21.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.31 : 25.25 = 15.68 : x
  2. Step 2: Convert to fraction form
    18.31/25.25 = 15.68/x
  3. Step 3: Cross multiply
    18.31x = 25.25 × 15.68
  4. Step 4: Simplify right side
    18.31x = 395.79
  5. Step 5: Solve for x
    x = 395.79/18.31
  6. Step 6: Final answer
    x = 21.62

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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.