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Finding the Fourth Proportional to 26.42, 39.60 and 21.86

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Solution

The fourth proportional to 26.42, 39.60 and 21.86 is: 32.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.42 : 39.60 = 21.86 : x
  2. Step 2: Convert to fraction form
    26.42/39.60 = 21.86/x
  3. Step 3: Cross multiply
    26.42x = 39.60 × 21.86
  4. Step 4: Simplify right side
    26.42x = 865.66
  5. Step 5: Solve for x
    x = 865.66/26.42
  6. Step 6: Final answer
    x = 32.77

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