Home / 129,720.20-178,993.28-73,120.64

Finding the Fourth Proportional to 129,720.20, 178,993.28 and 73,120.64

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Solution

The fourth proportional to 129,720.20, 178,993.28 and 73,120.64 is: 100,894.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,720.20 : 178,993.28 = 73,120.64 : x
  2. Step 2: Convert to fraction form
    129,720.20/178,993.28 = 73,120.64/x
  3. Step 3: Cross multiply
    129,720.20x = 178,993.28 × 73,120.64
  4. Step 4: Simplify right side
    129,720.20x = 13,088,103,189.30
  5. Step 5: Solve for x
    x = 13,088,103,189.30/129,720.20
  6. Step 6: Final answer
    x = 100,894.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.