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Finding the Fourth Proportional to 85,693.20, 128,539.80 and 83,943.60

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Solution

The fourth proportional to 85,693.20, 128,539.80 and 83,943.60 is: 125,915.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,693.20 : 128,539.80 = 83,943.60 : x
  2. Step 2: Convert to fraction form
    85,693.20/128,539.80 = 83,943.60/x
  3. Step 3: Cross multiply
    85,693.20x = 128,539.80 × 83,943.60
  4. Step 4: Simplify right side
    85,693.20x = 10,790,093,555.28
  5. Step 5: Solve for x
    x = 10,790,093,555.28/85,693.20
  6. Step 6: Final answer
    x = 125,915.40

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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.