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Finding the Fourth Proportional to 620,205.20, 930,307.80 and 611,910.80

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Solution

The fourth proportional to 620,205.20, 930,307.80 and 611,910.80 is: 917,866.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,205.20 : 930,307.80 = 611,910.80 : x
  2. Step 2: Convert to fraction form
    620,205.20/930,307.80 = 611,910.80/x
  3. Step 3: Cross multiply
    620,205.20x = 930,307.80 × 611,910.80
  4. Step 4: Simplify right side
    620,205.20x = 569,265,390,144.24
  5. Step 5: Solve for x
    x = 569,265,390,144.24/620,205.20
  6. Step 6: Final answer
    x = 917,866.20

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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.