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Finding the Fourth Proportional to 26.86, 40.20 and 18.28

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Solution

The fourth proportional to 26.86, 40.20 and 18.28 is: 27.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.86 : 40.20 = 18.28 : x
  2. Step 2: Convert to fraction form
    26.86/40.20 = 18.28/x
  3. Step 3: Cross multiply
    26.86x = 40.20 × 18.28
  4. Step 4: Simplify right side
    26.86x = 734.86
  5. Step 5: Solve for x
    x = 734.86/26.86
  6. Step 6: Final answer
    x = 27.36

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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.