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Finding the Fourth Proportional to 81,187.60, 121,608.60 and 67,363.60

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Solution

The fourth proportional to 81,187.60, 121,608.60 and 67,363.60 is: 100,902.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,187.60 : 121,608.60 = 67,363.60 : x
  2. Step 2: Convert to fraction form
    81,187.60/121,608.60 = 67,363.60/x
  3. Step 3: Cross multiply
    81,187.60x = 121,608.60 × 67,363.60
  4. Step 4: Simplify right side
    81,187.60x = 8,191,993,086.96
  5. Step 5: Solve for x
    x = 8,191,993,086.96/81,187.60
  6. Step 6: Final answer
    x = 100,902.02

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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.