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Finding the Fourth Proportional to 139,631.72, 192,692.58 and 75,969.95

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Solution

The fourth proportional to 139,631.72, 192,692.58 and 75,969.95 is: 104,838.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,631.72 : 192,692.58 = 75,969.95 : x
  2. Step 2: Convert to fraction form
    139,631.72/192,692.58 = 75,969.95/x
  3. Step 3: Cross multiply
    139,631.72x = 192,692.58 × 75,969.95
  4. Step 4: Simplify right side
    139,631.72x = 14,638,845,667.97
  5. Step 5: Solve for x
    x = 14,638,845,667.97/139,631.72
  6. Step 6: Final answer
    x = 104,838.97

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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.