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Finding the Fourth Proportional to 139,394.37, 192,373.75 and 78,965.51

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Solution

The fourth proportional to 139,394.37, 192,373.75 and 78,965.51 is: 108,977.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,394.37 : 192,373.75 = 78,965.51 : x
  2. Step 2: Convert to fraction form
    139,394.37/192,373.75 = 78,965.51/x
  3. Step 3: Cross multiply
    139,394.37x = 192,373.75 × 78,965.51
  4. Step 4: Simplify right side
    139,394.37x = 15,190,891,279.36
  5. Step 5: Solve for x
    x = 15,190,891,279.36/139,394.37
  6. Step 6: Final answer
    x = 108,977.80

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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.