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Finding the Fourth Proportional to 49.66, 68.49 and 47.79

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Solution

The fourth proportional to 49.66, 68.49 and 47.79 is: 65.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.66 : 68.49 = 47.79 : x
  2. Step 2: Convert to fraction form
    49.66/68.49 = 47.79/x
  3. Step 3: Cross multiply
    49.66x = 68.49 × 47.79
  4. Step 4: Simplify right side
    49.66x = 3,273.14
  5. Step 5: Solve for x
    x = 3,273.14/49.66
  6. Step 6: Final answer
    x = 65.91

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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.