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Finding the Fourth Proportional to 665,910.60, 998,938.80 and 644,915.40

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Solution

The fourth proportional to 665,910.60, 998,938.80 and 644,915.40 is: 967,443.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,910.60 : 998,938.80 = 644,915.40 : x
  2. Step 2: Convert to fraction form
    665,910.60/998,938.80 = 644,915.40/x
  3. Step 3: Cross multiply
    665,910.60x = 998,938.80 × 644,915.40
  4. Step 4: Simplify right side
    665,910.60x = 644,231,015,777.52
  5. Step 5: Solve for x
    x = 644,231,015,777.52/665,910.60
  6. Step 6: Final answer
    x = 967,443.70

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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.