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Finding the Fourth Proportional to 27.46, 41.20 and 18.90

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Solution

The fourth proportional to 27.46, 41.20 and 18.90 is: 28.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.46 : 41.20 = 18.90 : x
  2. Step 2: Convert to fraction form
    27.46/41.20 = 18.90/x
  3. Step 3: Cross multiply
    27.46x = 41.20 × 18.90
  4. Step 4: Simplify right side
    27.46x = 778.43
  5. Step 5: Solve for x
    x = 778.43/27.46
  6. Step 6: Final answer
    x = 28.34

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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.