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Finding the Fourth Proportional to 30,456, 45,690.72 and 12,940.80

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Solution

The fourth proportional to 30,456, 45,690.72 and 12,940.80 is: 19,414.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,456 : 45,690.72 = 12,940.80 : x
  2. Step 2: Convert to fraction form
    30,456/45,690.72 = 12,940.80/x
  3. Step 3: Cross multiply
    30,456x = 45,690.72 × 12,940.80
  4. Step 4: Simplify right side
    30,456x = 591,274,469.38
  5. Step 5: Solve for x
    x = 591,274,469.38/30,456
  6. Step 6: Final answer
    x = 19,414.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.