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Finding the Fourth Proportional to 26.39, 39.60 and 12.85

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Solution

The fourth proportional to 26.39, 39.60 and 12.85 is: 19.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.39 : 39.60 = 12.85 : x
  2. Step 2: Convert to fraction form
    26.39/39.60 = 12.85/x
  3. Step 3: Cross multiply
    26.39x = 39.60 × 12.85
  4. Step 4: Simplify right side
    26.39x = 508.76
  5. Step 5: Solve for x
    x = 508.76/26.39
  6. Step 6: Final answer
    x = 19.28

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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.