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Finding the Fourth Proportional to 81,406.90, 122,110.35 and 57,787.30

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Solution

The fourth proportional to 81,406.90, 122,110.35 and 57,787.30 is: 86,680.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,406.90 : 122,110.35 = 57,787.30 : x
  2. Step 2: Convert to fraction form
    81,406.90/122,110.35 = 57,787.30/x
  3. Step 3: Cross multiply
    81,406.90x = 122,110.35 × 57,787.30
  4. Step 4: Simplify right side
    81,406.90x = 7,056,427,428.56
  5. Step 5: Solve for x
    x = 7,056,427,428.56/81,406.90
  6. Step 6: Final answer
    x = 86,680.95

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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.