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Finding the Fourth Proportional to 259,715.70, 389,573.55 and 72,727.20

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Solution

The fourth proportional to 259,715.70, 389,573.55 and 72,727.20 is: 109,090.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,715.70 : 389,573.55 = 72,727.20 : x
  2. Step 2: Convert to fraction form
    259,715.70/389,573.55 = 72,727.20/x
  3. Step 3: Cross multiply
    259,715.70x = 389,573.55 × 72,727.20
  4. Step 4: Simplify right side
    259,715.70x = 28,332,593,485.56
  5. Step 5: Solve for x
    x = 28,332,593,485.56/259,715.70
  6. Step 6: Final answer
    x = 109,090.80

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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.