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Finding the Fourth Proportional to 49.96, 75 and 21.12

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Solution

The fourth proportional to 49.96, 75 and 21.12 is: 31.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.96 : 75 = 21.12 : x
  2. Step 2: Convert to fraction form
    49.96/75 = 21.12/x
  3. Step 3: Cross multiply
    49.96x = 75 × 21.12
  4. Step 4: Simplify right side
    49.96x = 1,584
  5. Step 5: Solve for x
    x = 1,584/49.96
  6. Step 6: Final answer
    x = 31.71

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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.