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Finding the Fourth Proportional to 192,091.20, 288,136.80 and 81,268.80

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Solution

The fourth proportional to 192,091.20, 288,136.80 and 81,268.80 is: 121,903.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,091.20 : 288,136.80 = 81,268.80 : x
  2. Step 2: Convert to fraction form
    192,091.20/288,136.80 = 81,268.80/x
  3. Step 3: Cross multiply
    192,091.20x = 288,136.80 × 81,268.80
  4. Step 4: Simplify right side
    192,091.20x = 23,416,531,971.84
  5. Step 5: Solve for x
    x = 23,416,531,971.84/192,091.20
  6. Step 6: Final answer
    x = 121,903.20

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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.