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Finding the Fourth Proportional to 18.16, 27.21 and 15.15

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Solution

The fourth proportional to 18.16, 27.21 and 15.15 is: 22.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.16 : 27.21 = 15.15 : x
  2. Step 2: Convert to fraction form
    18.16/27.21 = 15.15/x
  3. Step 3: Cross multiply
    18.16x = 27.21 × 15.15
  4. Step 4: Simplify right side
    18.16x = 412.23
  5. Step 5: Solve for x
    x = 412.23/18.16
  6. Step 6: Final answer
    x = 22.70

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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.