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Finding the Fourth Proportional to 139,786.80, 192,908 and 76,124.54

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Solution

The fourth proportional to 139,786.80, 192,908 and 76,124.54 is: 105,053.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,786.80 : 192,908 = 76,124.54 : x
  2. Step 2: Convert to fraction form
    139,786.80/192,908 = 76,124.54/x
  3. Step 3: Cross multiply
    139,786.80x = 192,908 × 76,124.54
  4. Step 4: Simplify right side
    139,786.80x = 14,685,032,762.32
  5. Step 5: Solve for x
    x = 14,685,032,762.32/139,786.80
  6. Step 6: Final answer
    x = 105,053.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.