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Finding the Fourth Proportional to 109.88, 164.64 and 85.84

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Solution

The fourth proportional to 109.88, 164.64 and 85.84 is: 128.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.88 : 164.64 = 85.84 : x
  2. Step 2: Convert to fraction form
    109.88/164.64 = 85.84/x
  3. Step 3: Cross multiply
    109.88x = 164.64 × 85.84
  4. Step 4: Simplify right side
    109.88x = 14,132.70
  5. Step 5: Solve for x
    x = 14,132.70/109.88
  6. Step 6: Final answer
    x = 128.62

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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.