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Finding the Fourth Proportional to 139,838, 192,979.70 and 79,399.04

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Solution

The fourth proportional to 139,838, 192,979.70 and 79,399.04 is: 109,572.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,838 : 192,979.70 = 79,399.04 : x
  2. Step 2: Convert to fraction form
    139,838/192,979.70 = 79,399.04/x
  3. Step 3: Cross multiply
    139,838x = 192,979.70 × 79,399.04
  4. Step 4: Simplify right side
    139,838x = 15,322,402,919.49
  5. Step 5: Solve for x
    x = 15,322,402,919.49/139,838
  6. Step 6: Final answer
    x = 109,572.53

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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.