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Finding the Fourth Proportional to 109.91, 164.79 and 52.15

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Solution

The fourth proportional to 109.91, 164.79 and 52.15 is: 78.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.91 : 164.79 = 52.15 : x
  2. Step 2: Convert to fraction form
    109.91/164.79 = 52.15/x
  3. Step 3: Cross multiply
    109.91x = 164.79 × 52.15
  4. Step 4: Simplify right side
    109.91x = 8,592.97
  5. Step 5: Solve for x
    x = 8,592.97/109.91
  6. Step 6: Final answer
    x = 78.19

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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.