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Finding the Fourth Proportional to 18.66, 28.01 and 8.51

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Solution

The fourth proportional to 18.66, 28.01 and 8.51 is: 12.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.66 : 28.01 = 8.51 : x
  2. Step 2: Convert to fraction form
    18.66/28.01 = 8.51/x
  3. Step 3: Cross multiply
    18.66x = 28.01 × 8.51
  4. Step 4: Simplify right side
    18.66x = 238.48
  5. Step 5: Solve for x
    x = 238.48/18.66
  6. Step 6: Final answer
    x = 12.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.