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Finding the Fourth Proportional to 22.42, 30.90 and 18.30

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Solution

The fourth proportional to 22.42, 30.90 and 18.30 is: 25.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.42 : 30.90 = 18.30 : x
  2. Step 2: Convert to fraction form
    22.42/30.90 = 18.30/x
  3. Step 3: Cross multiply
    22.42x = 30.90 × 18.30
  4. Step 4: Simplify right side
    22.42x = 565.47
  5. Step 5: Solve for x
    x = 565.47/22.42
  6. Step 6: Final answer
    x = 25.22

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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.