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Finding the Fourth Proportional to 85,792.56, 128,511.72 and 63,630.96

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Solution

The fourth proportional to 85,792.56, 128,511.72 and 63,630.96 is: 95,315.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,792.56 : 128,511.72 = 63,630.96 : x
  2. Step 2: Convert to fraction form
    85,792.56/128,511.72 = 63,630.96/x
  3. Step 3: Cross multiply
    85,792.56x = 128,511.72 × 63,630.96
  4. Step 4: Simplify right side
    85,792.56x = 8,177,324,114.85
  5. Step 5: Solve for x
    x = 8,177,324,114.85/85,792.56
  6. Step 6: Final answer
    x = 95,315.07

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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.