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Finding the Fourth Proportional to 22.80, 34.15 and 19.91

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Solution

The fourth proportional to 22.80, 34.15 and 19.91 is: 29.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.80 : 34.15 = 19.91 : x
  2. Step 2: Convert to fraction form
    22.80/34.15 = 19.91/x
  3. Step 3: Cross multiply
    22.80x = 34.15 × 19.91
  4. Step 4: Simplify right side
    22.80x = 679.94
  5. Step 5: Solve for x
    x = 679.94/22.80
  6. Step 6: Final answer
    x = 29.82

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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.