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Finding the Fourth Proportional to 612,140.70, 918,211.05 and 543,906.30

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Solution

The fourth proportional to 612,140.70, 918,211.05 and 543,906.30 is: 815,859.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,140.70 : 918,211.05 = 543,906.30 : x
  2. Step 2: Convert to fraction form
    612,140.70/918,211.05 = 543,906.30/x
  3. Step 3: Cross multiply
    612,140.70x = 918,211.05 × 543,906.30
  4. Step 4: Simplify right side
    612,140.70x = 499,420,774,824.62
  5. Step 5: Solve for x
    x = 499,420,774,824.62/612,140.70
  6. Step 6: Final answer
    x = 815,859.45

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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.