Home / 129,067.20-178,121.60-71,713.28

Finding the Fourth Proportional to 129,067.20, 178,121.60 and 71,713.28

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Solution

The fourth proportional to 129,067.20, 178,121.60 and 71,713.28 is: 98,969.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,067.20 : 178,121.60 = 71,713.28 : x
  2. Step 2: Convert to fraction form
    129,067.20/178,121.60 = 71,713.28/x
  3. Step 3: Cross multiply
    129,067.20x = 178,121.60 × 71,713.28
  4. Step 4: Simplify right side
    129,067.20x = 12,773,684,174.85
  5. Step 5: Solve for x
    x = 12,773,684,174.85/129,067.20
  6. Step 6: Final answer
    x = 98,969.25

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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.