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Finding the Fourth Proportional to 139,832.36, 192,969 and 76,168.79

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Solution

The fourth proportional to 139,832.36, 192,969 and 76,168.79 is: 105,113.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,832.36 : 192,969 = 76,168.79 : x
  2. Step 2: Convert to fraction form
    139,832.36/192,969 = 76,168.79/x
  3. Step 3: Cross multiply
    139,832.36x = 192,969 × 76,168.79
  4. Step 4: Simplify right side
    139,832.36x = 14,698,214,996.30
  5. Step 5: Solve for x
    x = 14,698,214,996.30/139,832.36
  6. Step 6: Final answer
    x = 105,113.12

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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.