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Finding the Fourth Proportional to 10.78, 16.17 and 5.69

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Solution

The fourth proportional to 10.78, 16.17 and 5.69 is: 8.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.78 : 16.17 = 5.69 : x
  2. Step 2: Convert to fraction form
    10.78/16.17 = 5.69/x
  3. Step 3: Cross multiply
    10.78x = 16.17 × 5.69
  4. Step 4: Simplify right side
    10.78x = 91.98
  5. Step 5: Solve for x
    x = 91.98/10.78
  6. Step 6: Final answer
    x = 8.54

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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.