Home / 91,788.40-137,974.20-86,539.60

Finding the Fourth Proportional to 91,788.40, 137,974.20 and 86,539.60

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Solution

The fourth proportional to 91,788.40, 137,974.20 and 86,539.60 is: 130,084.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,788.40 : 137,974.20 = 86,539.60 : x
  2. Step 2: Convert to fraction form
    91,788.40/137,974.20 = 86,539.60/x
  3. Step 3: Cross multiply
    91,788.40x = 137,974.20 × 86,539.60
  4. Step 4: Simplify right side
    91,788.40x = 11,940,232,078.32
  5. Step 5: Solve for x
    x = 11,940,232,078.32/91,788.40
  6. Step 6: Final answer
    x = 130,084.33

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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.