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Finding the Fourth Proportional to 128,534.80, 192,715.80 and 68,573.20

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Solution

The fourth proportional to 128,534.80, 192,715.80 and 68,573.20 is: 102,813.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,534.80 : 192,715.80 = 68,573.20 : x
  2. Step 2: Convert to fraction form
    128,534.80/192,715.80 = 68,573.20/x
  3. Step 3: Cross multiply
    128,534.80x = 192,715.80 × 68,573.20
  4. Step 4: Simplify right side
    128,534.80x = 13,215,139,096.56
  5. Step 5: Solve for x
    x = 13,215,139,096.56/128,534.80
  6. Step 6: Final answer
    x = 102,813.71

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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.