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Finding the Fourth Proportional to 26.50, 39.78 and 13.68

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Solution

The fourth proportional to 26.50, 39.78 and 13.68 is: 20.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.50 : 39.78 = 13.68 : x
  2. Step 2: Convert to fraction form
    26.50/39.78 = 13.68/x
  3. Step 3: Cross multiply
    26.50x = 39.78 × 13.68
  4. Step 4: Simplify right side
    26.50x = 544.19
  5. Step 5: Solve for x
    x = 544.19/26.50
  6. Step 6: Final answer
    x = 20.54

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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.