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Finding the Fourth Proportional to 139,368.15, 192,324.81 and 81,221.16

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Solution

The fourth proportional to 139,368.15, 192,324.81 and 81,221.16 is: 112,083.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,368.15 : 192,324.81 = 81,221.16 : x
  2. Step 2: Convert to fraction form
    139,368.15/192,324.81 = 81,221.16/x
  3. Step 3: Cross multiply
    139,368.15x = 192,324.81 × 81,221.16
  4. Step 4: Simplify right side
    139,368.15x = 15,620,844,164.98
  5. Step 5: Solve for x
    x = 15,620,844,164.98/139,368.15
  6. Step 6: Final answer
    x = 112,083.31

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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.