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Finding the Fourth Proportional to 239,940, 331,117.20 and 139,344.48

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Solution

The fourth proportional to 239,940, 331,117.20 and 139,344.48 is: 192,295.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,940 : 331,117.20 = 139,344.48 : x
  2. Step 2: Convert to fraction form
    239,940/331,117.20 = 139,344.48/x
  3. Step 3: Cross multiply
    239,940x = 331,117.20 × 139,344.48
  4. Step 4: Simplify right side
    239,940x = 46,139,354,053.06
  5. Step 5: Solve for x
    x = 46,139,354,053.06/239,940
  6. Step 6: Final answer
    x = 192,295.38

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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.