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Finding the Fourth Proportional to 139,678.77, 192,760.80 and 76,020.69

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Solution

The fourth proportional to 139,678.77, 192,760.80 and 76,020.69 is: 104,910.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,678.77 : 192,760.80 = 76,020.69 : x
  2. Step 2: Convert to fraction form
    139,678.77/192,760.80 = 76,020.69/x
  3. Step 3: Cross multiply
    139,678.77x = 192,760.80 × 76,020.69
  4. Step 4: Simplify right side
    139,678.77x = 14,653,809,020.95
  5. Step 5: Solve for x
    x = 14,653,809,020.95/139,678.77
  6. Step 6: Final answer
    x = 104,910.78

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1.5x scale

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.