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Finding the Fourth Proportional to 25.41, 35.10 and 21.81

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Solution

The fourth proportional to 25.41, 35.10 and 21.81 is: 30.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.41 : 35.10 = 21.81 : x
  2. Step 2: Convert to fraction form
    25.41/35.10 = 21.81/x
  3. Step 3: Cross multiply
    25.41x = 35.10 × 21.81
  4. Step 4: Simplify right side
    25.41x = 765.53
  5. Step 5: Solve for x
    x = 765.53/25.41
  6. Step 6: Final answer
    x = 30.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.