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Finding the Fourth Proportional to 81,993.60, 122,990.40 and 74,606.40

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Solution

The fourth proportional to 81,993.60, 122,990.40 and 74,606.40 is: 111,909.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,993.60 : 122,990.40 = 74,606.40 : x
  2. Step 2: Convert to fraction form
    81,993.60/122,990.40 = 74,606.40/x
  3. Step 3: Cross multiply
    81,993.60x = 122,990.40 × 74,606.40
  4. Step 4: Simplify right side
    81,993.60x = 9,175,870,978.56
  5. Step 5: Solve for x
    x = 9,175,870,978.56/81,993.60
  6. Step 6: Final answer
    x = 111,909.60

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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.