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Finding the Fourth Proportional to 111,379.60, 166,777.80 and 81,636.40

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Solution

The fourth proportional to 111,379.60, 166,777.80 and 81,636.40 is: 122,240.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,379.60 : 166,777.80 = 81,636.40 : x
  2. Step 2: Convert to fraction form
    111,379.60/166,777.80 = 81,636.40/x
  3. Step 3: Cross multiply
    111,379.60x = 166,777.80 × 81,636.40
  4. Step 4: Simplify right side
    111,379.60x = 13,615,139,191.92
  5. Step 5: Solve for x
    x = 13,615,139,191.92/111,379.60
  6. Step 6: Final answer
    x = 122,240.87

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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.