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Finding the Fourth Proportional to 191,969.20, 287,953.80 and 128,983.60

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Solution

The fourth proportional to 191,969.20, 287,953.80 and 128,983.60 is: 193,475.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,969.20 : 287,953.80 = 128,983.60 : x
  2. Step 2: Convert to fraction form
    191,969.20/287,953.80 = 128,983.60/x
  3. Step 3: Cross multiply
    191,969.20x = 287,953.80 × 128,983.60
  4. Step 4: Simplify right side
    191,969.20x = 37,141,317,757.68
  5. Step 5: Solve for x
    x = 37,141,317,757.68/191,969.20
  6. Step 6: Final answer
    x = 193,475.40

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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.