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Finding the Fourth Proportional to 26.40, 39.40 and 25.92

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Solution

The fourth proportional to 26.40, 39.40 and 25.92 is: 38.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.40 : 39.40 = 25.92 : x
  2. Step 2: Convert to fraction form
    26.40/39.40 = 25.92/x
  3. Step 3: Cross multiply
    26.40x = 39.40 × 25.92
  4. Step 4: Simplify right side
    26.40x = 1,021.25
  5. Step 5: Solve for x
    x = 1,021.25/26.40
  6. Step 6: Final answer
    x = 38.68

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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.