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Finding the Fourth Proportional to 139,346.91, 192,378.40 and 91,738.64

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Solution

The fourth proportional to 139,346.91, 192,378.40 and 91,738.64 is: 126,651.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,346.91 : 192,378.40 = 91,738.64 : x
  2. Step 2: Convert to fraction form
    139,346.91/192,378.40 = 91,738.64/x
  3. Step 3: Cross multiply
    139,346.91x = 192,378.40 × 91,738.64
  4. Step 4: Simplify right side
    139,346.91x = 17,648,533,032.98
  5. Step 5: Solve for x
    x = 17,648,533,032.98/139,346.91
  6. Step 6: Final answer
    x = 126,651.77

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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.