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Finding the Fourth Proportional to 128,575.89, 192,789.95 and 68,530.41

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Solution

The fourth proportional to 128,575.89, 192,789.95 and 68,530.41 is: 102,756.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,575.89 : 192,789.95 = 68,530.41 : x
  2. Step 2: Convert to fraction form
    128,575.89/192,789.95 = 68,530.41/x
  3. Step 3: Cross multiply
    128,575.89x = 192,789.95 × 68,530.41
  4. Step 4: Simplify right side
    128,575.89x = 13,211,973,974.73
  5. Step 5: Solve for x
    x = 13,211,973,974.73/128,575.89
  6. Step 6: Final answer
    x = 102,756.23

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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.