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Finding the Fourth Proportional to 139,703.40, 192,780.81 and 76,039.83

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Solution

The fourth proportional to 139,703.40, 192,780.81 and 76,039.83 is: 104,929.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,703.40 : 192,780.81 = 76,039.83 : x
  2. Step 2: Convert to fraction form
    139,703.40/192,780.81 = 76,039.83/x
  3. Step 3: Cross multiply
    139,703.40x = 192,780.81 × 76,039.83
  4. Step 4: Simplify right side
    139,703.40x = 14,659,020,019.66
  5. Step 5: Solve for x
    x = 14,659,020,019.66/139,703.40
  6. Step 6: Final answer
    x = 104,929.59

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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.