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Finding the Fourth Proportional to 139,831.43, 192,960.53 and 79,400.79

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Solution

The fourth proportional to 139,831.43, 192,960.53 and 79,400.79 is: 109,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,831.43 : 192,960.53 = 79,400.79 : x
  2. Step 2: Convert to fraction form
    139,831.43/192,960.53 = 79,400.79/x
  3. Step 3: Cross multiply
    139,831.43x = 192,960.53 × 79,400.79
  4. Step 4: Simplify right side
    139,831.43x = 15,321,217,556.02
  5. Step 5: Solve for x
    x = 15,321,217,556.02/139,831.43
  6. Step 6: Final answer
    x = 109,569.20

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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.