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Finding the Fourth Proportional to 16.78, 25.16 and 7.75

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Solution

The fourth proportional to 16.78, 25.16 and 7.75 is: 11.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.78 : 25.16 = 7.75 : x
  2. Step 2: Convert to fraction form
    16.78/25.16 = 7.75/x
  3. Step 3: Cross multiply
    16.78x = 25.16 × 7.75
  4. Step 4: Simplify right side
    16.78x = 194.99
  5. Step 5: Solve for x
    x = 194.99/16.78
  6. Step 6: Final answer
    x = 11.62

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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.