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Finding the Fourth Proportional to 25.85, 35.61 and 21.74

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Solution

The fourth proportional to 25.85, 35.61 and 21.74 is: 29.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.85 : 35.61 = 21.74 : x
  2. Step 2: Convert to fraction form
    25.85/35.61 = 21.74/x
  3. Step 3: Cross multiply
    25.85x = 35.61 × 21.74
  4. Step 4: Simplify right side
    25.85x = 774.16
  5. Step 5: Solve for x
    x = 774.16/25.85
  6. Step 6: Final answer
    x = 29.95

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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.