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Finding the Fourth Proportional to 612,140.20, 918,210.30 and 543,905.80

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Solution

The fourth proportional to 612,140.20, 918,210.30 and 543,905.80 is: 815,858.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,140.20 : 918,210.30 = 543,905.80 : x
  2. Step 2: Convert to fraction form
    612,140.20/918,210.30 = 543,905.80/x
  3. Step 3: Cross multiply
    612,140.20x = 918,210.30 × 543,905.80
  4. Step 4: Simplify right side
    612,140.20x = 499,419,907,789.74
  5. Step 5: Solve for x
    x = 499,419,907,789.74/612,140.20
  6. Step 6: Final answer
    x = 815,858.70

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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.