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Finding the Fourth Proportional to 543,763.80, 815,645.70 and 455,190.30

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Solution

The fourth proportional to 543,763.80, 815,645.70 and 455,190.30 is: 682,785.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,763.80 : 815,645.70 = 455,190.30 : x
  2. Step 2: Convert to fraction form
    543,763.80/815,645.70 = 455,190.30/x
  3. Step 3: Cross multiply
    543,763.80x = 815,645.70 × 455,190.30
  4. Step 4: Simplify right side
    543,763.80x = 371,274,010,876.71
  5. Step 5: Solve for x
    x = 371,274,010,876.71/543,763.80
  6. Step 6: Final answer
    x = 682,785.45

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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.