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Finding the Fourth Proportional to 73,080.80, 109,621.20 and 20,499.20

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Solution

The fourth proportional to 73,080.80, 109,621.20 and 20,499.20 is: 30,748.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,080.80 : 109,621.20 = 20,499.20 : x
  2. Step 2: Convert to fraction form
    73,080.80/109,621.20 = 20,499.20/x
  3. Step 3: Cross multiply
    73,080.80x = 109,621.20 × 20,499.20
  4. Step 4: Simplify right side
    73,080.80x = 2,247,146,903.04
  5. Step 5: Solve for x
    x = 2,247,146,903.04/73,080.80
  6. Step 6: Final answer
    x = 30,748.80

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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.