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Finding the Fourth Proportional to 109.89, 164.92 and 55.80

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Solution

The fourth proportional to 109.89, 164.92 and 55.80 is: 83.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.89 : 164.92 = 55.80 : x
  2. Step 2: Convert to fraction form
    109.89/164.92 = 55.80/x
  3. Step 3: Cross multiply
    109.89x = 164.92 × 55.80
  4. Step 4: Simplify right side
    109.89x = 9,201.57
  5. Step 5: Solve for x
    x = 9,201.57/109.89
  6. Step 6: Final answer
    x = 83.74

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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.