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Finding the Fourth Proportional to 110.21, 165.45 and 69.80

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Solution

The fourth proportional to 110.21, 165.45 and 69.80 is: 104.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.21 : 165.45 = 69.80 : x
  2. Step 2: Convert to fraction form
    110.21/165.45 = 69.80/x
  3. Step 3: Cross multiply
    110.21x = 165.45 × 69.80
  4. Step 4: Simplify right side
    110.21x = 11,548.41
  5. Step 5: Solve for x
    x = 11,548.41/110.21
  6. Step 6: Final answer
    x = 104.79

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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.