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Finding the Fourth Proportional to 49,782.40, 74,644.80 and 18,620.80

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Solution

The fourth proportional to 49,782.40, 74,644.80 and 18,620.80 is: 27,920.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    49,782.40 : 74,644.80 = 18,620.80 : x
  2. Step 2: Convert to fraction form
    49,782.40/74,644.80 = 18,620.80/x
  3. Step 3: Cross multiply
    49,782.40x = 74,644.80 × 18,620.80
  4. Step 4: Simplify right side
    49,782.40x = 1,389,945,891.84
  5. Step 5: Solve for x
    x = 1,389,945,891.84/49,782.40
  6. Step 6: Final answer
    x = 27,920.43

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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.