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Finding the Fourth Proportional to 19.75, 29.61 and 13.72

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Solution

The fourth proportional to 19.75, 29.61 and 13.72 is: 20.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.75 : 29.61 = 13.72 : x
  2. Step 2: Convert to fraction form
    19.75/29.61 = 13.72/x
  3. Step 3: Cross multiply
    19.75x = 29.61 × 13.72
  4. Step 4: Simplify right side
    19.75x = 406.25
  5. Step 5: Solve for x
    x = 406.25/19.75
  6. Step 6: Final answer
    x = 20.57

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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.