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Finding the Fourth Proportional to 25.55, 35.17 and 21.91

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Solution

The fourth proportional to 25.55, 35.17 and 21.91 is: 30.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.55 : 35.17 = 21.91 : x
  2. Step 2: Convert to fraction form
    25.55/35.17 = 21.91/x
  3. Step 3: Cross multiply
    25.55x = 35.17 × 21.91
  4. Step 4: Simplify right side
    25.55x = 770.57
  5. Step 5: Solve for x
    x = 770.57/25.55
  6. Step 6: Final answer
    x = 30.16

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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.