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Finding the Fourth Proportional to 139,395.75, 192,358.94 and 75,731.91

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Solution

The fourth proportional to 139,395.75, 192,358.94 and 75,731.91 is: 104,506.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,395.75 : 192,358.94 = 75,731.91 : x
  2. Step 2: Convert to fraction form
    139,395.75/192,358.94 = 75,731.91/x
  3. Step 3: Cross multiply
    139,395.75x = 192,358.94 × 75,731.91
  4. Step 4: Simplify right side
    139,395.75x = 14,567,709,553.12
  5. Step 5: Solve for x
    x = 14,567,709,553.12/139,395.75
  6. Step 6: Final answer
    x = 104,506.12

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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.