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Finding the Fourth Proportional to 34.19, 51.25 and 13.90

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Solution

The fourth proportional to 34.19, 51.25 and 13.90 is: 20.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.19 : 51.25 = 13.90 : x
  2. Step 2: Convert to fraction form
    34.19/51.25 = 13.90/x
  3. Step 3: Cross multiply
    34.19x = 51.25 × 13.90
  4. Step 4: Simplify right side
    34.19x = 712.38
  5. Step 5: Solve for x
    x = 712.38/34.19
  6. Step 6: Final answer
    x = 20.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.