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Finding the Fourth Proportional to 26.59, 39.86 and 8.55

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Solution

The fourth proportional to 26.59, 39.86 and 8.55 is: 12.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.59 : 39.86 = 8.55 : x
  2. Step 2: Convert to fraction form
    26.59/39.86 = 8.55/x
  3. Step 3: Cross multiply
    26.59x = 39.86 × 8.55
  4. Step 4: Simplify right side
    26.59x = 340.60
  5. Step 5: Solve for x
    x = 340.60/26.59
  6. Step 6: Final answer
    x = 12.81

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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.