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Finding the Fourth Proportional to 49.87, 74.82 and 21.39

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Solution

The fourth proportional to 49.87, 74.82 and 21.39 is: 32.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.87 : 74.82 = 21.39 : x
  2. Step 2: Convert to fraction form
    49.87/74.82 = 21.39/x
  3. Step 3: Cross multiply
    49.87x = 74.82 × 21.39
  4. Step 4: Simplify right side
    49.87x = 1,600.40
  5. Step 5: Solve for x
    x = 1,600.40/49.87
  6. Step 6: Final answer
    x = 32.09

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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.