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Finding the Fourth Proportional to 34.90, 48.15 and 20.34

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Solution

The fourth proportional to 34.90, 48.15 and 20.34 is: 28.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.90 : 48.15 = 20.34 : x
  2. Step 2: Convert to fraction form
    34.90/48.15 = 20.34/x
  3. Step 3: Cross multiply
    34.90x = 48.15 × 20.34
  4. Step 4: Simplify right side
    34.90x = 979.37
  5. Step 5: Solve for x
    x = 979.37/34.90
  6. Step 6: Final answer
    x = 28.06

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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.