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Finding the Fourth Proportional to 19.72, 29.45 and 18.73

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Solution

The fourth proportional to 19.72, 29.45 and 18.73 is: 27.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.72 : 29.45 = 18.73 : x
  2. Step 2: Convert to fraction form
    19.72/29.45 = 18.73/x
  3. Step 3: Cross multiply
    19.72x = 29.45 × 18.73
  4. Step 4: Simplify right side
    19.72x = 551.50
  5. Step 5: Solve for x
    x = 551.50/19.72
  6. Step 6: Final answer
    x = 27.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.