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Finding the Fourth Proportional to 49.40, 74.09 and 20.51

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Solution

The fourth proportional to 49.40, 74.09 and 20.51 is: 30.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.40 : 74.09 = 20.51 : x
  2. Step 2: Convert to fraction form
    49.40/74.09 = 20.51/x
  3. Step 3: Cross multiply
    49.40x = 74.09 × 20.51
  4. Step 4: Simplify right side
    49.40x = 1,519.11
  5. Step 5: Solve for x
    x = 1,519.11/49.40
  6. Step 6: Final answer
    x = 30.75

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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.