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Finding the Fourth Proportional to 85,306.70, 127,960.05 and 40,910.60

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Solution

The fourth proportional to 85,306.70, 127,960.05 and 40,910.60 is: 61,365.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,306.70 : 127,960.05 = 40,910.60 : x
  2. Step 2: Convert to fraction form
    85,306.70/127,960.05 = 40,910.60/x
  3. Step 3: Cross multiply
    85,306.70x = 127,960.05 × 40,910.60
  4. Step 4: Simplify right side
    85,306.70x = 5,234,922,421.53
  5. Step 5: Solve for x
    x = 5,234,922,421.53/85,306.70
  6. Step 6: Final answer
    x = 61,365.90

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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.