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Finding the Fourth Proportional to 643,991.10, 965,986.65 and 455,034.30

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Solution

The fourth proportional to 643,991.10, 965,986.65 and 455,034.30 is: 682,551.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,991.10 : 965,986.65 = 455,034.30 : x
  2. Step 2: Convert to fraction form
    643,991.10/965,986.65 = 455,034.30/x
  3. Step 3: Cross multiply
    643,991.10x = 965,986.65 × 455,034.30
  4. Step 4: Simplify right side
    643,991.10x = 439,557,059,092.10
  5. Step 5: Solve for x
    x = 439,557,059,092.10/643,991.10
  6. Step 6: Final answer
    x = 682,551.45

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Double scale
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Similar ratio
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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.