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Finding the Fourth Proportional to 49.89, 74.71 and 39.81

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Solution

The fourth proportional to 49.89, 74.71 and 39.81 is: 59.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.89 : 74.71 = 39.81 : x
  2. Step 2: Convert to fraction form
    49.89/74.71 = 39.81/x
  3. Step 3: Cross multiply
    49.89x = 74.71 × 39.81
  4. Step 4: Simplify right side
    49.89x = 2,974.21
  5. Step 5: Solve for x
    x = 2,974.21/49.89
  6. Step 6: Final answer
    x = 59.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.