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Finding the Fourth Proportional to 48,720.20, 73,039.80 and 20,661.80

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Solution

The fourth proportional to 48,720.20, 73,039.80 and 20,661.80 is: 30,975.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,720.20 : 73,039.80 = 20,661.80 : x
  2. Step 2: Convert to fraction form
    48,720.20/73,039.80 = 20,661.80/x
  3. Step 3: Cross multiply
    48,720.20x = 73,039.80 × 20,661.80
  4. Step 4: Simplify right side
    48,720.20x = 1,509,133,739.64
  5. Step 5: Solve for x
    x = 1,509,133,739.64/48,720.20
  6. Step 6: Final answer
    x = 30,975.52

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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.