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Finding the Fourth Proportional to 127,979.80, 191,969.70 and 85,989.40

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Solution

The fourth proportional to 127,979.80, 191,969.70 and 85,989.40 is: 128,984.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,979.80 : 191,969.70 = 85,989.40 : x
  2. Step 2: Convert to fraction form
    127,979.80/191,969.70 = 85,989.40/x
  3. Step 3: Cross multiply
    127,979.80x = 191,969.70 × 85,989.40
  4. Step 4: Simplify right side
    127,979.80x = 16,507,359,321.18
  5. Step 5: Solve for x
    x = 16,507,359,321.18/127,979.80
  6. Step 6: Final answer
    x = 128,984.10

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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.