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Finding the Fourth Proportional to 139,341.26, 192,290.87 and 78,911.89

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Solution

The fourth proportional to 139,341.26, 192,290.87 and 78,911.89 is: 108,898.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,341.26 : 192,290.87 = 78,911.89 : x
  2. Step 2: Convert to fraction form
    139,341.26/192,290.87 = 78,911.89/x
  3. Step 3: Cross multiply
    139,341.26x = 192,290.87 × 78,911.89
  4. Step 4: Simplify right side
    139,341.26x = 15,174,035,698.00
  5. Step 5: Solve for x
    x = 15,174,035,698.00/139,341.26
  6. Step 6: Final answer
    x = 108,898.37

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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.