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Finding the Fourth Proportional to 17.20, 25.65 and 15.68

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Solution

The fourth proportional to 17.20, 25.65 and 15.68 is: 23.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.20 : 25.65 = 15.68 : x
  2. Step 2: Convert to fraction form
    17.20/25.65 = 15.68/x
  3. Step 3: Cross multiply
    17.20x = 25.65 × 15.68
  4. Step 4: Simplify right side
    17.20x = 402.11
  5. Step 5: Solve for x
    x = 402.11/17.20
  6. Step 6: Final answer
    x = 23.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.