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Finding the Fourth Proportional to 25.81, 38.76 and 21.54

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Solution

The fourth proportional to 25.81, 38.76 and 21.54 is: 32.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.81 : 38.76 = 21.54 : x
  2. Step 2: Convert to fraction form
    25.81/38.76 = 21.54/x
  3. Step 3: Cross multiply
    25.81x = 38.76 × 21.54
  4. Step 4: Simplify right side
    25.81x = 834.89
  5. Step 5: Solve for x
    x = 834.89/25.81
  6. Step 6: Final answer
    x = 32.35

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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.