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Finding the Fourth Proportional to 643,905.80, 965,081.10 and 328,200.20

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Solution

The fourth proportional to 643,905.80, 965,081.10 and 328,200.20 is: 491,903.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,905.80 : 965,081.10 = 328,200.20 : x
  2. Step 2: Convert to fraction form
    643,905.80/965,081.10 = 328,200.20/x
  3. Step 3: Cross multiply
    643,905.80x = 965,081.10 × 328,200.20
  4. Step 4: Simplify right side
    643,905.80x = 316,739,810,036.22
  5. Step 5: Solve for x
    x = 316,739,810,036.22/643,905.80
  6. Step 6: Final answer
    x = 491,903.96

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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.