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Finding the Fourth Proportional to 139,803.12, 192,930.53 and 79,372.53

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Solution

The fourth proportional to 139,803.12, 192,930.53 and 79,372.53 is: 109,535.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,803.12 : 192,930.53 = 79,372.53 : x
  2. Step 2: Convert to fraction form
    139,803.12/192,930.53 = 79,372.53/x
  3. Step 3: Cross multiply
    139,803.12x = 192,930.53 × 79,372.53
  4. Step 4: Simplify right side
    139,803.12x = 15,313,383,883.48
  5. Step 5: Solve for x
    x = 15,313,383,883.48/139,803.12
  6. Step 6: Final answer
    x = 109,535.35

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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.