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Finding the Fourth Proportional to 49.99, 69.05 and 39.75

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Solution

The fourth proportional to 49.99, 69.05 and 39.75 is: 54.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.99 : 69.05 = 39.75 : x
  2. Step 2: Convert to fraction form
    49.99/69.05 = 39.75/x
  3. Step 3: Cross multiply
    49.99x = 69.05 × 39.75
  4. Step 4: Simplify right side
    49.99x = 2,744.74
  5. Step 5: Solve for x
    x = 2,744.74/49.99
  6. Step 6: Final answer
    x = 54.91

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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.