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Finding the Fourth Proportional to 34.36, 47.42 and 19.81

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Solution

The fourth proportional to 34.36, 47.42 and 19.81 is: 27.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.36 : 47.42 = 19.81 : x
  2. Step 2: Convert to fraction form
    34.36/47.42 = 19.81/x
  3. Step 3: Cross multiply
    34.36x = 47.42 × 19.81
  4. Step 4: Simplify right side
    34.36x = 939.17
  5. Step 5: Solve for x
    x = 939.17/34.36
  6. Step 6: Final answer
    x = 27.34

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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.