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Finding the Fourth Proportional to 86,112.80, 128,938.80 and 54,778.40

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Solution

The fourth proportional to 86,112.80, 128,938.80 and 54,778.40 is: 82,021.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,112.80 : 128,938.80 = 54,778.40 : x
  2. Step 2: Convert to fraction form
    86,112.80/128,938.80 = 54,778.40/x
  3. Step 3: Cross multiply
    86,112.80x = 128,938.80 × 54,778.40
  4. Step 4: Simplify right side
    86,112.80x = 7,063,061,161.92
  5. Step 5: Solve for x
    x = 7,063,061,161.92/86,112.80
  6. Step 6: Final answer
    x = 82,021.04

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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.