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Finding the Fourth Proportional to 19.80, 27.28 and 16.56

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Solution

The fourth proportional to 19.80, 27.28 and 16.56 is: 22.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.80 : 27.28 = 16.56 : x
  2. Step 2: Convert to fraction form
    19.80/27.28 = 16.56/x
  3. Step 3: Cross multiply
    19.80x = 27.28 × 16.56
  4. Step 4: Simplify right side
    19.80x = 451.76
  5. Step 5: Solve for x
    x = 451.76/19.80
  6. Step 6: Final answer
    x = 22.82

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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.