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Finding the Fourth Proportional to 19.72, 29.74 and 18.42

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Solution

The fourth proportional to 19.72, 29.74 and 18.42 is: 27.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.72 : 29.74 = 18.42 : x
  2. Step 2: Convert to fraction form
    19.72/29.74 = 18.42/x
  3. Step 3: Cross multiply
    19.72x = 29.74 × 18.42
  4. Step 4: Simplify right side
    19.72x = 547.81
  5. Step 5: Solve for x
    x = 547.81/19.72
  6. Step 6: Final answer
    x = 27.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.