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Finding the Fourth Proportional to 25.92, 39.06 and 21.96

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Solution

The fourth proportional to 25.92, 39.06 and 21.96 is: 33.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.92 : 39.06 = 21.96 : x
  2. Step 2: Convert to fraction form
    25.92/39.06 = 21.96/x
  3. Step 3: Cross multiply
    25.92x = 39.06 × 21.96
  4. Step 4: Simplify right side
    25.92x = 857.76
  5. Step 5: Solve for x
    x = 857.76/25.92
  6. Step 6: Final answer
    x = 33.09

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.