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Finding the Fourth Proportional to 49.63, 74.39 and 19.21

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Solution

The fourth proportional to 49.63, 74.39 and 19.21 is: 28.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.63 : 74.39 = 19.21 : x
  2. Step 2: Convert to fraction form
    49.63/74.39 = 19.21/x
  3. Step 3: Cross multiply
    49.63x = 74.39 × 19.21
  4. Step 4: Simplify right side
    49.63x = 1,429.03
  5. Step 5: Solve for x
    x = 1,429.03/49.63
  6. Step 6: Final answer
    x = 28.79

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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.