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Finding the Fourth Proportional to 81,795.60, 122,693.40 and 68,770.80

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Solution

The fourth proportional to 81,795.60, 122,693.40 and 68,770.80 is: 103,156.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,795.60 : 122,693.40 = 68,770.80 : x
  2. Step 2: Convert to fraction form
    81,795.60/122,693.40 = 68,770.80/x
  3. Step 3: Cross multiply
    81,795.60x = 122,693.40 × 68,770.80
  4. Step 4: Simplify right side
    81,795.60x = 8,437,723,272.72
  5. Step 5: Solve for x
    x = 8,437,723,272.72/81,795.60
  6. Step 6: Final answer
    x = 103,156.20

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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.