Home / 72,720.16-109,080.39-20,129.80

Finding the Fourth Proportional to 72,720.16, 109,080.39 and 20,129.80

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Solution

The fourth proportional to 72,720.16, 109,080.39 and 20,129.80 is: 30,194.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,720.16 : 109,080.39 = 20,129.80 : x
  2. Step 2: Convert to fraction form
    72,720.16/109,080.39 = 20,129.80/x
  3. Step 3: Cross multiply
    72,720.16x = 109,080.39 × 20,129.80
  4. Step 4: Simplify right side
    72,720.16x = 2,195,766,434.62
  5. Step 5: Solve for x
    x = 2,195,766,434.62/72,720.16
  6. Step 6: Final answer
    x = 30,194.74

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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.