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Finding the Fourth Proportional to 139,393.84, 192,321.12 and 78,954.88

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Solution

The fourth proportional to 139,393.84, 192,321.12 and 78,954.88 is: 108,933.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,393.84 : 192,321.12 = 78,954.88 : x
  2. Step 2: Convert to fraction form
    139,393.84/192,321.12 = 78,954.88/x
  3. Step 3: Cross multiply
    139,393.84x = 192,321.12 × 78,954.88
  4. Step 4: Simplify right side
    139,393.84x = 15,184,690,951.07
  5. Step 5: Solve for x
    x = 15,184,690,951.07/139,393.84
  6. Step 6: Final answer
    x = 108,933.73

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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.