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Finding the Fourth Proportional to 22.38, 33.72 and 19.20

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Solution

The fourth proportional to 22.38, 33.72 and 19.20 is: 28.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.38 : 33.72 = 19.20 : x
  2. Step 2: Convert to fraction form
    22.38/33.72 = 19.20/x
  3. Step 3: Cross multiply
    22.38x = 33.72 × 19.20
  4. Step 4: Simplify right side
    22.38x = 647.42
  5. Step 5: Solve for x
    x = 647.42/22.38
  6. Step 6: Final answer
    x = 28.93

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.