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Finding the Fourth Proportional to 139,389.84, 192,315.60 and 78,950.88

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Solution

The fourth proportional to 139,389.84, 192,315.60 and 78,950.88 is: 108,928.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,389.84 : 192,315.60 = 78,950.88 : x
  2. Step 2: Convert to fraction form
    139,389.84/192,315.60 = 78,950.88/x
  3. Step 3: Cross multiply
    139,389.84x = 192,315.60 × 78,950.88
  4. Step 4: Simplify right side
    139,389.84x = 15,183,485,857.73
  5. Step 5: Solve for x
    x = 15,183,485,857.73/139,389.84
  6. Step 6: Final answer
    x = 108,928.21

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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.