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Finding the Fourth Proportional to 109.53, 164.21 and 63.90

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Solution

The fourth proportional to 109.53, 164.21 and 63.90 is: 95.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.53 : 164.21 = 63.90 : x
  2. Step 2: Convert to fraction form
    109.53/164.21 = 63.90/x
  3. Step 3: Cross multiply
    109.53x = 164.21 × 63.90
  4. Step 4: Simplify right side
    109.53x = 10,492.70
  5. Step 5: Solve for x
    x = 10,492.70/109.53
  6. Step 6: Final answer
    x = 95.80

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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.