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Finding the Fourth Proportional to 85,838.40, 128,757.60 and 57,844.80

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Solution

The fourth proportional to 85,838.40, 128,757.60 and 57,844.80 is: 86,767.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,838.40 : 128,757.60 = 57,844.80 : x
  2. Step 2: Convert to fraction form
    85,838.40/128,757.60 = 57,844.80/x
  3. Step 3: Cross multiply
    85,838.40x = 128,757.60 × 57,844.80
  4. Step 4: Simplify right side
    85,838.40x = 7,447,957,620.48
  5. Step 5: Solve for x
    x = 7,447,957,620.48/85,838.40
  6. Step 6: Final answer
    x = 86,767.20

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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.