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Finding the Fourth Proportional to 39.94, 55.12 and 22.69

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Solution

The fourth proportional to 39.94, 55.12 and 22.69 is: 31.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.94 : 55.12 = 22.69 : x
  2. Step 2: Convert to fraction form
    39.94/55.12 = 22.69/x
  3. Step 3: Cross multiply
    39.94x = 55.12 × 22.69
  4. Step 4: Simplify right side
    39.94x = 1,250.56
  5. Step 5: Solve for x
    x = 1,250.56/39.94
  6. Step 6: Final answer
    x = 31.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.