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Finding the Fourth Proportional to 139,690.70, 192,786.62 and 86,007.14

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Solution

The fourth proportional to 139,690.70, 192,786.62 and 86,007.14 is: 118,698.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,690.70 : 192,786.62 = 86,007.14 : x
  2. Step 2: Convert to fraction form
    139,690.70/192,786.62 = 86,007.14/x
  3. Step 3: Cross multiply
    139,690.70x = 192,786.62 × 86,007.14
  4. Step 4: Simplify right side
    139,690.70x = 16,581,025,816.47
  5. Step 5: Solve for x
    x = 16,581,025,816.47/139,690.70
  6. Step 6: Final answer
    x = 118,698.14

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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.