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Finding the Fourth Proportional to 139,728.92, 192,827.11 and 76,066.57

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Solution

The fourth proportional to 139,728.92, 192,827.11 and 76,066.57 is: 104,972.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,728.92 : 192,827.11 = 76,066.57 : x
  2. Step 2: Convert to fraction form
    139,728.92/192,827.11 = 76,066.57/x
  3. Step 3: Cross multiply
    139,728.92x = 192,827.11 × 76,066.57
  4. Step 4: Simplify right side
    139,728.92x = 14,667,696,188.48
  5. Step 5: Solve for x
    x = 14,667,696,188.48/139,728.92
  6. Step 6: Final answer
    x = 104,972.51

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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.