Home / 129,107.52-178,218.63-81,351.54

Finding the Fourth Proportional to 129,107.52, 178,218.63 and 81,351.54

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Solution

The fourth proportional to 129,107.52, 178,218.63 and 81,351.54 is: 112,296.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,107.52 : 178,218.63 = 81,351.54 : x
  2. Step 2: Convert to fraction form
    129,107.52/178,218.63 = 81,351.54/x
  3. Step 3: Cross multiply
    129,107.52x = 178,218.63 × 81,351.54
  4. Step 4: Simplify right side
    129,107.52x = 14,498,360,007.19
  5. Step 5: Solve for x
    x = 14,498,360,007.19/129,107.52
  6. Step 6: Final answer
    x = 112,296.79

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1.5x scale

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.