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Finding the Fourth Proportional to 287,947.80, 431,921.70 and 193,469.40

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Solution

The fourth proportional to 287,947.80, 431,921.70 and 193,469.40 is: 290,204.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,947.80 : 431,921.70 = 193,469.40 : x
  2. Step 2: Convert to fraction form
    287,947.80/431,921.70 = 193,469.40/x
  3. Step 3: Cross multiply
    287,947.80x = 431,921.70 × 193,469.40
  4. Step 4: Simplify right side
    287,947.80x = 83,563,632,145.98
  5. Step 5: Solve for x
    x = 83,563,632,145.98/287,947.80
  6. Step 6: Final answer
    x = 290,204.10

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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.