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Finding the Fourth Proportional to 81,490.60, 122,235.90 and 69,826.60

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Solution

The fourth proportional to 81,490.60, 122,235.90 and 69,826.60 is: 104,739.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,490.60 : 122,235.90 = 69,826.60 : x
  2. Step 2: Convert to fraction form
    81,490.60/122,235.90 = 69,826.60/x
  3. Step 3: Cross multiply
    81,490.60x = 122,235.90 × 69,826.60
  4. Step 4: Simplify right side
    81,490.60x = 8,535,317,294.94
  5. Step 5: Solve for x
    x = 8,535,317,294.94/81,490.60
  6. Step 6: Final answer
    x = 104,739.90

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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.