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Finding the Fourth Proportional to 139,160.81, 192,051.43 and 78,731.44

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Solution

The fourth proportional to 139,160.81, 192,051.43 and 78,731.44 is: 108,654.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,160.81 : 192,051.43 = 78,731.44 : x
  2. Step 2: Convert to fraction form
    139,160.81/192,051.43 = 78,731.44/x
  3. Step 3: Cross multiply
    139,160.81x = 192,051.43 × 78,731.44
  4. Step 4: Simplify right side
    139,160.81x = 15,120,485,637.96
  5. Step 5: Solve for x
    x = 15,120,485,637.96/139,160.81
  6. Step 6: Final answer
    x = 108,654.77

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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.