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Finding the Fourth Proportional to 69.64, 104.46 and 20.88

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Solution

The fourth proportional to 69.64, 104.46 and 20.88 is: 31.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.64 : 104.46 = 20.88 : x
  2. Step 2: Convert to fraction form
    69.64/104.46 = 20.88/x
  3. Step 3: Cross multiply
    69.64x = 104.46 × 20.88
  4. Step 4: Simplify right side
    69.64x = 2,181.12
  5. Step 5: Solve for x
    x = 2,181.12/69.64
  6. Step 6: Final answer
    x = 31.32

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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.