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Finding the Fourth Proportional to 127,969.60, 191,954.40 and 85,979.20

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Solution

The fourth proportional to 127,969.60, 191,954.40 and 85,979.20 is: 128,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,969.60 : 191,954.40 = 85,979.20 : x
  2. Step 2: Convert to fraction form
    127,969.60/191,954.40 = 85,979.20/x
  3. Step 3: Cross multiply
    127,969.60x = 191,954.40 × 85,979.20
  4. Step 4: Simplify right side
    127,969.60x = 16,504,085,748.48
  5. Step 5: Solve for x
    x = 16,504,085,748.48/127,969.60
  6. Step 6: Final answer
    x = 128,968.80

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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.