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Finding the Fourth Proportional to 22.30, 30.81 and 15.39

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Solution

The fourth proportional to 22.30, 30.81 and 15.39 is: 21.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.30 : 30.81 = 15.39 : x
  2. Step 2: Convert to fraction form
    22.30/30.81 = 15.39/x
  3. Step 3: Cross multiply
    22.30x = 30.81 × 15.39
  4. Step 4: Simplify right side
    22.30x = 474.09
  5. Step 5: Solve for x
    x = 474.09/22.30
  6. Step 6: Final answer
    x = 21.26

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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.