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Finding the Fourth Proportional to 19.89, 27.46 and 18.27

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Solution

The fourth proportional to 19.89, 27.46 and 18.27 is: 25.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.89 : 27.46 = 18.27 : x
  2. Step 2: Convert to fraction form
    19.89/27.46 = 18.27/x
  3. Step 3: Cross multiply
    19.89x = 27.46 × 18.27
  4. Step 4: Simplify right side
    19.89x = 501.60
  5. Step 5: Solve for x
    x = 501.60/19.89
  6. Step 6: Final answer
    x = 25.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.