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Finding the Fourth Proportional to 25.19, 34.83 and 21.55

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Solution

The fourth proportional to 25.19, 34.83 and 21.55 is: 29.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.19 : 34.83 = 21.55 : x
  2. Step 2: Convert to fraction form
    25.19/34.83 = 21.55/x
  3. Step 3: Cross multiply
    25.19x = 34.83 × 21.55
  4. Step 4: Simplify right side
    25.19x = 750.30
  5. Step 5: Solve for x
    x = 750.30/25.19
  6. Step 6: Final answer
    x = 29.79

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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.