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Finding the Fourth Proportional to 19.71, 27.20 and 13.87

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Solution

The fourth proportional to 19.71, 27.20 and 13.87 is: 19.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.71 : 27.20 = 13.87 : x
  2. Step 2: Convert to fraction form
    19.71/27.20 = 13.87/x
  3. Step 3: Cross multiply
    19.71x = 27.20 × 13.87
  4. Step 4: Simplify right side
    19.71x = 377.26
  5. Step 5: Solve for x
    x = 377.26/19.71
  6. Step 6: Final answer
    x = 19.14

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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.