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Finding the Fourth Proportional to 109.49, 164.20 and 87.88

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Solution

The fourth proportional to 109.49, 164.20 and 87.88 is: 131.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.49 : 164.20 = 87.88 : x
  2. Step 2: Convert to fraction form
    109.49/164.20 = 87.88/x
  3. Step 3: Cross multiply
    109.49x = 164.20 × 87.88
  4. Step 4: Simplify right side
    109.49x = 14,429.31
  5. Step 5: Solve for x
    x = 14,429.31/109.49
  6. Step 6: Final answer
    x = 131.78

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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.