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Finding the Fourth Proportional to 16.20, 22.40 and 15.70

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Solution

The fourth proportional to 16.20, 22.40 and 15.70 is: 21.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.20 : 22.40 = 15.70 : x
  2. Step 2: Convert to fraction form
    16.20/22.40 = 15.70/x
  3. Step 3: Cross multiply
    16.20x = 22.40 × 15.70
  4. Step 4: Simplify right side
    16.20x = 351.68
  5. Step 5: Solve for x
    x = 351.68/16.20
  6. Step 6: Final answer
    x = 21.71

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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.