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Finding the Fourth Proportional to 50, 74.69 and 39.84

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Solution

The fourth proportional to 50, 74.69 and 39.84 is: 59.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    50 : 74.69 = 39.84 : x
  2. Step 2: Convert to fraction form
    50/74.69 = 39.84/x
  3. Step 3: Cross multiply
    50x = 74.69 × 39.84
  4. Step 4: Simplify right side
    50x = 2,975.65
  5. Step 5: Solve for x
    x = 2,975.65/50
  6. Step 6: Final answer
    x = 59.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.