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Finding the Fourth Proportional to 641,680.80, 962,521.20 and 612,156.30

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Solution

The fourth proportional to 641,680.80, 962,521.20 and 612,156.30 is: 918,234.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,680.80 : 962,521.20 = 612,156.30 : x
  2. Step 2: Convert to fraction form
    641,680.80/962,521.20 = 612,156.30/x
  3. Step 3: Cross multiply
    641,680.80x = 962,521.20 × 612,156.30
  4. Step 4: Simplify right side
    641,680.80x = 589,213,416,463.56
  5. Step 5: Solve for x
    x = 589,213,416,463.56/641,680.80
  6. Step 6: Final answer
    x = 918,234.45

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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.