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Finding the Fourth Proportional to 18.45, 27.72 and 15.12

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Solution

The fourth proportional to 18.45, 27.72 and 15.12 is: 22.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.45 : 27.72 = 15.12 : x
  2. Step 2: Convert to fraction form
    18.45/27.72 = 15.12/x
  3. Step 3: Cross multiply
    18.45x = 27.72 × 15.12
  4. Step 4: Simplify right side
    18.45x = 419.13
  5. Step 5: Solve for x
    x = 419.13/18.45
  6. Step 6: Final answer
    x = 22.72

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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.