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Finding the Fourth Proportional to 49.80, 68.70 and 38.92

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Solution

The fourth proportional to 49.80, 68.70 and 38.92 is: 53.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.80 : 68.70 = 38.92 : x
  2. Step 2: Convert to fraction form
    49.80/68.70 = 38.92/x
  3. Step 3: Cross multiply
    49.80x = 68.70 × 38.92
  4. Step 4: Simplify right side
    49.80x = 2,673.80
  5. Step 5: Solve for x
    x = 2,673.80/49.80
  6. Step 6: Final answer
    x = 53.69

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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.