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Finding the Fourth Proportional to 245,791.50, 339,188.20 and 138,361.20

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Solution

The fourth proportional to 245,791.50, 339,188.20 and 138,361.20 is: 190,936.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,791.50 : 339,188.20 = 138,361.20 : x
  2. Step 2: Convert to fraction form
    245,791.50/339,188.20 = 138,361.20/x
  3. Step 3: Cross multiply
    245,791.50x = 339,188.20 × 138,361.20
  4. Step 4: Simplify right side
    245,791.50x = 46,930,486,377.84
  5. Step 5: Solve for x
    x = 46,930,486,377.84/245,791.50
  6. Step 6: Final answer
    x = 190,936.16

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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.