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Finding the Fourth Proportional to 139,256.66, 192,120.37 and 78,813.45

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Solution

The fourth proportional to 139,256.66, 192,120.37 and 78,813.45 is: 108,732.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,256.66 : 192,120.37 = 78,813.45 : x
  2. Step 2: Convert to fraction form
    139,256.66/192,120.37 = 78,813.45/x
  3. Step 3: Cross multiply
    139,256.66x = 192,120.37 × 78,813.45
  4. Step 4: Simplify right side
    139,256.66x = 15,141,669,174.98
  5. Step 5: Solve for x
    x = 15,141,669,174.98/139,256.66
  6. Step 6: Final answer
    x = 108,732.10

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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.