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Finding the Fourth Proportional to 16.60, 22.80 and 15.84

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Solution

The fourth proportional to 16.60, 22.80 and 15.84 is: 21.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.60 : 22.80 = 15.84 : x
  2. Step 2: Convert to fraction form
    16.60/22.80 = 15.84/x
  3. Step 3: Cross multiply
    16.60x = 22.80 × 15.84
  4. Step 4: Simplify right side
    16.60x = 361.15
  5. Step 5: Solve for x
    x = 361.15/16.60
  6. Step 6: Final answer
    x = 21.76

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.