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Finding the Fourth Proportional to 17.16, 25.78 and 12.90

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Solution

The fourth proportional to 17.16, 25.78 and 12.90 is: 19.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.16 : 25.78 = 12.90 : x
  2. Step 2: Convert to fraction form
    17.16/25.78 = 12.90/x
  3. Step 3: Cross multiply
    17.16x = 25.78 × 12.90
  4. Step 4: Simplify right side
    17.16x = 332.56
  5. Step 5: Solve for x
    x = 332.56/17.16
  6. Step 6: Final answer
    x = 19.38

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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.