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Finding the Fourth Proportional to 259,846.80, 389,771.10 and 79,931.01

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Solution

The fourth proportional to 259,846.80, 389,771.10 and 79,931.01 is: 119,896.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,846.80 : 389,771.10 = 79,931.01 : x
  2. Step 2: Convert to fraction form
    259,846.80/389,771.10 = 79,931.01/x
  3. Step 3: Cross multiply
    259,846.80x = 389,771.10 × 79,931.01
  4. Step 4: Simplify right side
    259,846.80x = 31,154,796,517.56
  5. Step 5: Solve for x
    x = 31,154,796,517.56/259,846.80
  6. Step 6: Final answer
    x = 119,896.79

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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.