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Finding the Fourth Proportional to 139,223.36, 192,128.11 and 78,792.91

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Solution

The fourth proportional to 139,223.36, 192,128.11 and 78,792.91 is: 108,734.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,223.36 : 192,128.11 = 78,792.91 : x
  2. Step 2: Convert to fraction form
    139,223.36/192,128.11 = 78,792.91/x
  3. Step 3: Cross multiply
    139,223.36x = 192,128.11 × 78,792.91
  4. Step 4: Simplify right side
    139,223.36x = 15,138,332,879.70
  5. Step 5: Solve for x
    x = 15,138,332,879.70/139,223.36
  6. Step 6: Final answer
    x = 108,734.14

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1.5x scale

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.