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Finding the Fourth Proportional to 80,661.60, 121,011.60 and 33,890.40

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Solution

The fourth proportional to 80,661.60, 121,011.60 and 33,890.40 is: 50,843.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,661.60 : 121,011.60 = 33,890.40 : x
  2. Step 2: Convert to fraction form
    80,661.60/121,011.60 = 33,890.40/x
  3. Step 3: Cross multiply
    80,661.60x = 121,011.60 × 33,890.40
  4. Step 4: Simplify right side
    80,661.60x = 4,101,131,528.64
  5. Step 5: Solve for x
    x = 4,101,131,528.64/80,661.60
  6. Step 6: Final answer
    x = 50,843.67

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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.