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Finding the Fourth Proportional to 12.81, 19.22 and 4.80

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Solution

The fourth proportional to 12.81, 19.22 and 4.80 is: 7.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.81 : 19.22 = 4.80 : x
  2. Step 2: Convert to fraction form
    12.81/19.22 = 4.80/x
  3. Step 3: Cross multiply
    12.81x = 19.22 × 4.80
  4. Step 4: Simplify right side
    12.81x = 92.26
  5. Step 5: Solve for x
    x = 92.26/12.81
  6. Step 6: Final answer
    x = 7.20

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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.