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Finding the Fourth Proportional to 49.90, 74.81 and 30.62

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Solution

The fourth proportional to 49.90, 74.81 and 30.62 is: 45.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.90 : 74.81 = 30.62 : x
  2. Step 2: Convert to fraction form
    49.90/74.81 = 30.62/x
  3. Step 3: Cross multiply
    49.90x = 74.81 × 30.62
  4. Step 4: Simplify right side
    49.90x = 2,290.53
  5. Step 5: Solve for x
    x = 2,290.53/49.90
  6. Step 6: Final answer
    x = 45.91

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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.