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Finding the Fourth Proportional to 39.70, 54.79 and 22.22

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Solution

The fourth proportional to 39.70, 54.79 and 22.22 is: 30.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.70 : 54.79 = 22.22 : x
  2. Step 2: Convert to fraction form
    39.70/54.79 = 22.22/x
  3. Step 3: Cross multiply
    39.70x = 54.79 × 22.22
  4. Step 4: Simplify right side
    39.70x = 1,217.27
  5. Step 5: Solve for x
    x = 1,217.27/39.70
  6. Step 6: Final answer
    x = 30.66

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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.