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Finding the Fourth Proportional to 139,353.12, 192,309.38 and 78,922.24

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Solution

The fourth proportional to 139,353.12, 192,309.38 and 78,922.24 is: 108,913.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,353.12 : 192,309.38 = 78,922.24 : x
  2. Step 2: Convert to fraction form
    139,353.12/192,309.38 = 78,922.24/x
  3. Step 3: Cross multiply
    139,353.12x = 192,309.38 × 78,922.24
  4. Step 4: Simplify right side
    139,353.12x = 15,177,487,042.61
  5. Step 5: Solve for x
    x = 15,177,487,042.61/139,353.12
  6. Step 6: Final answer
    x = 108,913.87

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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.