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Finding the Fourth Proportional to 641,143.80, 961,715.70 and 611,619.30

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Solution

The fourth proportional to 641,143.80, 961,715.70 and 611,619.30 is: 917,428.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,143.80 : 961,715.70 = 611,619.30 : x
  2. Step 2: Convert to fraction form
    641,143.80/961,715.70 = 611,619.30/x
  3. Step 3: Cross multiply
    641,143.80x = 961,715.70 × 611,619.30
  4. Step 4: Simplify right side
    641,143.80x = 588,203,883,233.01
  5. Step 5: Solve for x
    x = 588,203,883,233.01/641,143.80
  6. Step 6: Final answer
    x = 917,428.95

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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.