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Finding the Fourth Proportional to 26.20, 36.21 and 21.60

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Solution

The fourth proportional to 26.20, 36.21 and 21.60 is: 29.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.20 : 36.21 = 21.60 : x
  2. Step 2: Convert to fraction form
    26.20/36.21 = 21.60/x
  3. Step 3: Cross multiply
    26.20x = 36.21 × 21.60
  4. Step 4: Simplify right side
    26.20x = 782.14
  5. Step 5: Solve for x
    x = 782.14/26.20
  6. Step 6: Final answer
    x = 29.85

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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.