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Finding the Fourth Proportional to 139,640.59, 192,723.78 and 79,226.20

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Solution

The fourth proportional to 139,640.59, 192,723.78 and 79,226.20 is: 109,343.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,640.59 : 192,723.78 = 79,226.20 : x
  2. Step 2: Convert to fraction form
    139,640.59/192,723.78 = 79,226.20/x
  3. Step 3: Cross multiply
    139,640.59x = 192,723.78 × 79,226.20
  4. Step 4: Simplify right side
    139,640.59x = 15,268,772,739.04
  5. Step 5: Solve for x
    x = 15,268,772,739.04/139,640.59
  6. Step 6: Final answer
    x = 109,343.37

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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.