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Finding the Fourth Proportional to 25.80, 38.67 and 16.80

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Solution

The fourth proportional to 25.80, 38.67 and 16.80 is: 25.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.80 : 38.67 = 16.80 : x
  2. Step 2: Convert to fraction form
    25.80/38.67 = 16.80/x
  3. Step 3: Cross multiply
    25.80x = 38.67 × 16.80
  4. Step 4: Simplify right side
    25.80x = 649.66
  5. Step 5: Solve for x
    x = 649.66/25.80
  6. Step 6: Final answer
    x = 25.18

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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.