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Finding the Fourth Proportional to 245,800.40, 339,236.89 and 138,391.36

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Solution

The fourth proportional to 245,800.40, 339,236.89 and 138,391.36 is: 190,998.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,800.40 : 339,236.89 = 138,391.36 : x
  2. Step 2: Convert to fraction form
    245,800.40/339,236.89 = 138,391.36/x
  3. Step 3: Cross multiply
    245,800.40x = 339,236.89 × 138,391.36
  4. Step 4: Simplify right side
    245,800.40x = 46,947,453,375.20
  5. Step 5: Solve for x
    x = 46,947,453,375.20/245,800.40
  6. Step 6: Final answer
    x = 190,998.28

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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.