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Finding the Fourth Proportional to 25.23, 34.81 and 15.53

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Solution

The fourth proportional to 25.23, 34.81 and 15.53 is: 21.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.23 : 34.81 = 15.53 : x
  2. Step 2: Convert to fraction form
    25.23/34.81 = 15.53/x
  3. Step 3: Cross multiply
    25.23x = 34.81 × 15.53
  4. Step 4: Simplify right side
    25.23x = 540.65
  5. Step 5: Solve for x
    x = 540.65/25.23
  6. Step 6: Final answer
    x = 21.43

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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.