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Finding the Fourth Proportional to 25.42, 34.92 and 21.10

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Solution

The fourth proportional to 25.42, 34.92 and 21.10 is: 28.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.42 : 34.92 = 21.10 : x
  2. Step 2: Convert to fraction form
    25.42/34.92 = 21.10/x
  3. Step 3: Cross multiply
    25.42x = 34.92 × 21.10
  4. Step 4: Simplify right side
    25.42x = 736.81
  5. Step 5: Solve for x
    x = 736.81/25.42
  6. Step 6: Final answer
    x = 28.99

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.