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Finding the Fourth Proportional to 34.80, 52.21 and 21.26

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Solution

The fourth proportional to 34.80, 52.21 and 21.26 is: 31.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.80 : 52.21 = 21.26 : x
  2. Step 2: Convert to fraction form
    34.80/52.21 = 21.26/x
  3. Step 3: Cross multiply
    34.80x = 52.21 × 21.26
  4. Step 4: Simplify right side
    34.80x = 1,110.14
  5. Step 5: Solve for x
    x = 1,110.14/34.80
  6. Step 6: Final answer
    x = 31.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.