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Finding the Fourth Proportional to 19.85, 27.36 and 13.68

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Solution

The fourth proportional to 19.85, 27.36 and 13.68 is: 18.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.85 : 27.36 = 13.68 : x
  2. Step 2: Convert to fraction form
    19.85/27.36 = 13.68/x
  3. Step 3: Cross multiply
    19.85x = 27.36 × 13.68
  4. Step 4: Simplify right side
    19.85x = 374.28
  5. Step 5: Solve for x
    x = 374.28/19.85
  6. Step 6: Final answer
    x = 18.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.