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Finding the Fourth Proportional to 22.10, 30.50 and 12.40

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Solution

The fourth proportional to 22.10, 30.50 and 12.40 is: 17.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.10 : 30.50 = 12.40 : x
  2. Step 2: Convert to fraction form
    22.10/30.50 = 12.40/x
  3. Step 3: Cross multiply
    22.10x = 30.50 × 12.40
  4. Step 4: Simplify right side
    22.10x = 378.22
  5. Step 5: Solve for x
    x = 378.22/22.10
  6. Step 6: Final answer
    x = 17.11

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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.