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Finding the Fourth Proportional to 19.69, 29.40 and 16.80

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Solution

The fourth proportional to 19.69, 29.40 and 16.80 is: 25.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.69 : 29.40 = 16.80 : x
  2. Step 2: Convert to fraction form
    19.69/29.40 = 16.80/x
  3. Step 3: Cross multiply
    19.69x = 29.40 × 16.80
  4. Step 4: Simplify right side
    19.69x = 494.01
  5. Step 5: Solve for x
    x = 494.01/19.69
  6. Step 6: Final answer
    x = 25.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.