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Finding the Fourth Proportional to 34.35, 47.40 and 19.79

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Solution

The fourth proportional to 34.35, 47.40 and 19.79 is: 27.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.35 : 47.40 = 19.79 : x
  2. Step 2: Convert to fraction form
    34.35/47.40 = 19.79/x
  3. Step 3: Cross multiply
    34.35x = 47.40 × 19.79
  4. Step 4: Simplify right side
    34.35x = 938.05
  5. Step 5: Solve for x
    x = 938.05/34.35
  6. Step 6: Final answer
    x = 27.31

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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.