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Finding the Fourth Proportional to 139,396.14, 192,368.02 and 78,965.49

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Solution

The fourth proportional to 139,396.14, 192,368.02 and 78,965.49 is: 108,973.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,396.14 : 192,368.02 = 78,965.49 : x
  2. Step 2: Convert to fraction form
    139,396.14/192,368.02 = 78,965.49/x
  3. Step 3: Cross multiply
    139,396.14x = 192,368.02 × 78,965.49
  4. Step 4: Simplify right side
    139,396.14x = 15,190,434,959.63
  5. Step 5: Solve for x
    x = 15,190,434,959.63/139,396.14
  6. Step 6: Final answer
    x = 108,973.14

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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.