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Finding the Fourth Proportional to 85,302.72, 127,915.20 and 43,778.88

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Solution

The fourth proportional to 85,302.72, 127,915.20 and 43,778.88 is: 65,648.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,302.72 : 127,915.20 = 43,778.88 : x
  2. Step 2: Convert to fraction form
    85,302.72/127,915.20 = 43,778.88/x
  3. Step 3: Cross multiply
    85,302.72x = 127,915.20 × 43,778.88
  4. Step 4: Simplify right side
    85,302.72x = 5,599,984,190.98
  5. Step 5: Solve for x
    x = 5,599,984,190.98/85,302.72
  6. Step 6: Final answer
    x = 65,648.37

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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.