Home / 128,216.20-192,065.10-86,225.80

Finding the Fourth Proportional to 128,216.20, 192,065.10 and 86,225.80

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Solution

The fourth proportional to 128,216.20, 192,065.10 and 86,225.80 is: 129,164.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,216.20 : 192,065.10 = 86,225.80 : x
  2. Step 2: Convert to fraction form
    128,216.20/192,065.10 = 86,225.80/x
  3. Step 3: Cross multiply
    128,216.20x = 192,065.10 × 86,225.80
  4. Step 4: Simplify right side
    128,216.20x = 16,560,966,899.58
  5. Step 5: Solve for x
    x = 16,560,966,899.58/128,216.20
  6. Step 6: Final answer
    x = 129,164.39

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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.