Home / 80,861.60-121,399.20-69,090.75

Finding the Fourth Proportional to 80,861.60, 121,399.20 and 69,090.75

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Solution

The fourth proportional to 80,861.60, 121,399.20 and 69,090.75 is: 103,727.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,861.60 : 121,399.20 = 69,090.75 : x
  2. Step 2: Convert to fraction form
    80,861.60/121,399.20 = 69,090.75/x
  3. Step 3: Cross multiply
    80,861.60x = 121,399.20 × 69,090.75
  4. Step 4: Simplify right side
    80,861.60x = 8,387,561,777.40
  5. Step 5: Solve for x
    x = 8,387,561,777.40/80,861.60
  6. Step 6: Final answer
    x = 103,727.38

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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.