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Finding the Fourth Proportional to 16.43, 22.78 and 15.70

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Solution

The fourth proportional to 16.43, 22.78 and 15.70 is: 21.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.43 : 22.78 = 15.70 : x
  2. Step 2: Convert to fraction form
    16.43/22.78 = 15.70/x
  3. Step 3: Cross multiply
    16.43x = 22.78 × 15.70
  4. Step 4: Simplify right side
    16.43x = 357.55
  5. Step 5: Solve for x
    x = 357.55/16.43
  6. Step 6: Final answer
    x = 21.76

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.