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Finding the Fourth Proportional to 18.63, 27.90 and 15.42

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Solution

The fourth proportional to 18.63, 27.90 and 15.42 is: 23.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.63 : 27.90 = 15.42 : x
  2. Step 2: Convert to fraction form
    18.63/27.90 = 15.42/x
  3. Step 3: Cross multiply
    18.63x = 27.90 × 15.42
  4. Step 4: Simplify right side
    18.63x = 430.22
  5. Step 5: Solve for x
    x = 430.22/18.63
  6. Step 6: Final answer
    x = 23.09

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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.