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Finding the Fourth Proportional to 39.61, 59.39 and 16.78

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Solution

The fourth proportional to 39.61, 59.39 and 16.78 is: 25.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.61 : 59.39 = 16.78 : x
  2. Step 2: Convert to fraction form
    39.61/59.39 = 16.78/x
  3. Step 3: Cross multiply
    39.61x = 59.39 × 16.78
  4. Step 4: Simplify right side
    39.61x = 996.56
  5. Step 5: Solve for x
    x = 996.56/39.61
  6. Step 6: Final answer
    x = 25.16

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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.