Home / 128,619.80-192,929.70-86,629.40

Finding the Fourth Proportional to 128,619.80, 192,929.70 and 86,629.40

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Solution

The fourth proportional to 128,619.80, 192,929.70 and 86,629.40 is: 129,944.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,619.80 : 192,929.70 = 86,629.40 : x
  2. Step 2: Convert to fraction form
    128,619.80/192,929.70 = 86,629.40/x
  3. Step 3: Cross multiply
    128,619.80x = 192,929.70 × 86,629.40
  4. Step 4: Simplify right side
    128,619.80x = 16,713,384,153.18
  5. Step 5: Solve for x
    x = 16,713,384,153.18/128,619.80
  6. Step 6: Final answer
    x = 129,944.10

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1.5x scale

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.