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Finding the Fourth Proportional to 20.63, 30.95 and 7.79

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Solution

The fourth proportional to 20.63, 30.95 and 7.79 is: 11.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.63 : 30.95 = 7.79 : x
  2. Step 2: Convert to fraction form
    20.63/30.95 = 7.79/x
  3. Step 3: Cross multiply
    20.63x = 30.95 × 7.79
  4. Step 4: Simplify right side
    20.63x = 241.10
  5. Step 5: Solve for x
    x = 241.10/20.63
  6. Step 6: Final answer
    x = 11.69

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