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Finding the Fourth Proportional to 139,578.21, 192,535.85 and 87,812.97

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Solution

The fourth proportional to 139,578.21, 192,535.85 and 87,812.97 is: 121,130.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,578.21 : 192,535.85 = 87,812.97 : x
  2. Step 2: Convert to fraction form
    139,578.21/192,535.85 = 87,812.97/x
  3. Step 3: Cross multiply
    139,578.21x = 192,535.85 × 87,812.97
  4. Step 4: Simplify right side
    139,578.21x = 16,907,144,819.97
  5. Step 5: Solve for x
    x = 16,907,144,819.97/139,578.21
  6. Step 6: Final answer
    x = 121,130.26

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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.