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Finding the Fourth Proportional to 139,331.87, 192,312.40 and 78,938.09

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Solution

The fourth proportional to 139,331.87, 192,312.40 and 78,938.09 is: 108,954.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,331.87 : 192,312.40 = 78,938.09 : x
  2. Step 2: Convert to fraction form
    139,331.87/192,312.40 = 78,938.09/x
  3. Step 3: Cross multiply
    139,331.87x = 192,312.40 × 78,938.09
  4. Step 4: Simplify right side
    139,331.87x = 15,180,773,822.75
  5. Step 5: Solve for x
    x = 15,180,773,822.75/139,331.87
  6. Step 6: Final answer
    x = 108,954.06

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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.