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Finding the Fourth Proportional to 620,145.20, 930,217.80 and 611,850.80

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Solution

The fourth proportional to 620,145.20, 930,217.80 and 611,850.80 is: 917,776.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,145.20 : 930,217.80 = 611,850.80 : x
  2. Step 2: Convert to fraction form
    620,145.20/930,217.80 = 611,850.80/x
  3. Step 3: Cross multiply
    620,145.20x = 930,217.80 × 611,850.80
  4. Step 4: Simplify right side
    620,145.20x = 569,154,505,104.24
  5. Step 5: Solve for x
    x = 569,154,505,104.24/620,145.20
  6. Step 6: Final answer
    x = 917,776.20

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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.