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Finding the Fourth Proportional to 18.70, 28.15 and 15.12

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Solution

The fourth proportional to 18.70, 28.15 and 15.12 is: 22.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.70 : 28.15 = 15.12 : x
  2. Step 2: Convert to fraction form
    18.70/28.15 = 15.12/x
  3. Step 3: Cross multiply
    18.70x = 28.15 × 15.12
  4. Step 4: Simplify right side
    18.70x = 425.59
  5. Step 5: Solve for x
    x = 425.59/18.70
  6. Step 6: Final answer
    x = 22.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.