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Finding the Fourth Proportional to 22.43, 30.91 and 14.65

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Solution

The fourth proportional to 22.43, 30.91 and 14.65 is: 20.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.43 : 30.91 = 14.65 : x
  2. Step 2: Convert to fraction form
    22.43/30.91 = 14.65/x
  3. Step 3: Cross multiply
    22.43x = 30.91 × 14.65
  4. Step 4: Simplify right side
    22.43x = 452.95
  5. Step 5: Solve for x
    x = 452.95/22.43
  6. Step 6: Final answer
    x = 20.20

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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.