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Finding the Fourth Proportional to 30,391.98, 41,907.87 and 19,761.90

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Solution

The fourth proportional to 30,391.98, 41,907.87 and 19,761.90 is: 27,249.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,391.98 : 41,907.87 = 19,761.90 : x
  2. Step 2: Convert to fraction form
    30,391.98/41,907.87 = 19,761.90/x
  3. Step 3: Cross multiply
    30,391.98x = 41,907.87 × 19,761.90
  4. Step 4: Simplify right side
    30,391.98x = 828,179,136.15
  5. Step 5: Solve for x
    x = 828,179,136.15/30,391.98
  6. Step 6: Final answer
    x = 27,249.92

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1.5x scale

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.