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Finding the Fourth Proportional to 26.86, 40.21 and 20.09

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Solution

The fourth proportional to 26.86, 40.21 and 20.09 is: 30.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.86 : 40.21 = 20.09 : x
  2. Step 2: Convert to fraction form
    26.86/40.21 = 20.09/x
  3. Step 3: Cross multiply
    26.86x = 40.21 × 20.09
  4. Step 4: Simplify right side
    26.86x = 807.82
  5. Step 5: Solve for x
    x = 807.82/26.86
  6. Step 6: Final answer
    x = 30.08

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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.