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Finding the Fourth Proportional to 80,720.94, 121,081.01 and 20,749.35

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Solution

The fourth proportional to 80,720.94, 121,081.01 and 20,749.35 is: 31,123.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,720.94 : 121,081.01 = 20,749.35 : x
  2. Step 2: Convert to fraction form
    80,720.94/121,081.01 = 20,749.35/x
  3. Step 3: Cross multiply
    80,720.94x = 121,081.01 × 20,749.35
  4. Step 4: Simplify right side
    80,720.94x = 2,512,352,453.80
  5. Step 5: Solve for x
    x = 2,512,352,453.80/80,720.94
  6. Step 6: Final answer
    x = 31,123.92

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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.