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Finding the Fourth Proportional to 26.76, 39.86 and 25.20

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Solution

The fourth proportional to 26.76, 39.86 and 25.20 is: 37.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.76 : 39.86 = 25.20 : x
  2. Step 2: Convert to fraction form
    26.76/39.86 = 25.20/x
  3. Step 3: Cross multiply
    26.76x = 39.86 × 25.20
  4. Step 4: Simplify right side
    26.76x = 1,004.47
  5. Step 5: Solve for x
    x = 1,004.47/26.76
  6. Step 6: Final answer
    x = 37.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.