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Finding the Fourth Proportional to 80,990.70, 121,485.99 and 43,499.16

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Solution

The fourth proportional to 80,990.70, 121,485.99 and 43,499.16 is: 65,248.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,990.70 : 121,485.99 = 43,499.16 : x
  2. Step 2: Convert to fraction form
    80,990.70/121,485.99 = 43,499.16/x
  3. Step 3: Cross multiply
    80,990.70x = 121,485.99 × 43,499.16
  4. Step 4: Simplify right side
    80,990.70x = 5,284,538,516.77
  5. Step 5: Solve for x
    x = 5,284,538,516.77/80,990.70
  6. Step 6: Final answer
    x = 65,248.71

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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.