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Finding the Fourth Proportional to 128,502.80, 192,667.80 and 68,541.20

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Solution

The fourth proportional to 128,502.80, 192,667.80 and 68,541.20 is: 102,765.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,502.80 : 192,667.80 = 68,541.20 : x
  2. Step 2: Convert to fraction form
    128,502.80/192,667.80 = 68,541.20/x
  3. Step 3: Cross multiply
    128,502.80x = 192,667.80 × 68,541.20
  4. Step 4: Simplify right side
    128,502.80x = 13,205,682,213.36
  5. Step 5: Solve for x
    x = 13,205,682,213.36/128,502.80
  6. Step 6: Final answer
    x = 102,765.72

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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.