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Finding the Fourth Proportional to 139,509.54, 192,553.74 and 91,767.60

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Solution

The fourth proportional to 139,509.54, 192,553.74 and 91,767.60 is: 126,659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,509.54 : 192,553.74 = 91,767.60 : x
  2. Step 2: Convert to fraction form
    139,509.54/192,553.74 = 91,767.60/x
  3. Step 3: Cross multiply
    139,509.54x = 192,553.74 × 91,767.60
  4. Step 4: Simplify right side
    139,509.54x = 17,670,194,590.82
  5. Step 5: Solve for x
    x = 17,670,194,590.82/139,509.54
  6. Step 6: Final answer
    x = 126,659.40

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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.