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Finding the Fourth Proportional to 620,603.40, 930,905.10 and 221,257.20

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Solution

The fourth proportional to 620,603.40, 930,905.10 and 221,257.20 is: 331,885.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,603.40 : 930,905.10 = 221,257.20 : x
  2. Step 2: Convert to fraction form
    620,603.40/930,905.10 = 221,257.20/x
  3. Step 3: Cross multiply
    620,603.40x = 930,905.10 × 221,257.20
  4. Step 4: Simplify right side
    620,603.40x = 205,969,455,891.72
  5. Step 5: Solve for x
    x = 205,969,455,891.72/620,603.40
  6. Step 6: Final answer
    x = 331,885.80

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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.