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Finding the Fourth Proportional to 139,431.30, 192,415.26 and 75,768.94

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Solution

The fourth proportional to 139,431.30, 192,415.26 and 75,768.94 is: 104,561.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,431.30 : 192,415.26 = 75,768.94 : x
  2. Step 2: Convert to fraction form
    139,431.30/192,415.26 = 75,768.94/x
  3. Step 3: Cross multiply
    139,431.30x = 192,415.26 × 75,768.94
  4. Step 4: Simplify right side
    139,431.30x = 14,579,100,290.02
  5. Step 5: Solve for x
    x = 14,579,100,290.02/139,431.30
  6. Step 6: Final answer
    x = 104,561.17

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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.