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Finding the Fourth Proportional to 26.26, 36.21 and 15.90

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Solution

The fourth proportional to 26.26, 36.21 and 15.90 is: 21.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.26 : 36.21 = 15.90 : x
  2. Step 2: Convert to fraction form
    26.26/36.21 = 15.90/x
  3. Step 3: Cross multiply
    26.26x = 36.21 × 15.90
  4. Step 4: Simplify right side
    26.26x = 575.66
  5. Step 5: Solve for x
    x = 575.66/26.26
  6. Step 6: Final answer
    x = 21.92

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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.