Home / 128,209.20-192,054.60-86,218.80

Finding the Fourth Proportional to 128,209.20, 192,054.60 and 86,218.80

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Solution

The fourth proportional to 128,209.20, 192,054.60 and 86,218.80 is: 129,153.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,209.20 : 192,054.60 = 86,218.80 : x
  2. Step 2: Convert to fraction form
    128,209.20/192,054.60 = 86,218.80/x
  3. Step 3: Cross multiply
    128,209.20x = 192,054.60 × 86,218.80
  4. Step 4: Simplify right side
    128,209.20x = 16,558,717,146.48
  5. Step 5: Solve for x
    x = 16,558,717,146.48/128,209.20
  6. Step 6: Final answer
    x = 129,153.89

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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.