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Finding the Fourth Proportional to 36.75, 55.09 and 20.69

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Solution

The fourth proportional to 36.75, 55.09 and 20.69 is: 31.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.75 : 55.09 = 20.69 : x
  2. Step 2: Convert to fraction form
    36.75/55.09 = 20.69/x
  3. Step 3: Cross multiply
    36.75x = 55.09 × 20.69
  4. Step 4: Simplify right side
    36.75x = 1,139.81
  5. Step 5: Solve for x
    x = 1,139.81/36.75
  6. Step 6: Final answer
    x = 31.02

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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.