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Finding the Fourth Proportional to 49.57, 68.40 and 28.85

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Solution

The fourth proportional to 49.57, 68.40 and 28.85 is: 39.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.57 : 68.40 = 28.85 : x
  2. Step 2: Convert to fraction form
    49.57/68.40 = 28.85/x
  3. Step 3: Cross multiply
    49.57x = 68.40 × 28.85
  4. Step 4: Simplify right side
    49.57x = 1,973.34
  5. Step 5: Solve for x
    x = 1,973.34/49.57
  6. Step 6: Final answer
    x = 39.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.