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Finding the Fourth Proportional to 14.78, 22.18 and 12.18

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Solution

The fourth proportional to 14.78, 22.18 and 12.18 is: 18.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.78 : 22.18 = 12.18 : x
  2. Step 2: Convert to fraction form
    14.78/22.18 = 12.18/x
  3. Step 3: Cross multiply
    14.78x = 22.18 × 12.18
  4. Step 4: Simplify right side
    14.78x = 270.15
  5. Step 5: Solve for x
    x = 270.15/14.78
  6. Step 6: Final answer
    x = 18.28

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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.