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Finding the Fourth Proportional to 7,893.20, 11,839.80 and 4,782.80

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Solution

The fourth proportional to 7,893.20, 11,839.80 and 4,782.80 is: 7,174.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,893.20 : 11,839.80 = 4,782.80 : x
  2. Step 2: Convert to fraction form
    7,893.20/11,839.80 = 4,782.80/x
  3. Step 3: Cross multiply
    7,893.20x = 11,839.80 × 4,782.80
  4. Step 4: Simplify right side
    7,893.20x = 56,627,395.44
  5. Step 5: Solve for x
    x = 56,627,395.44/7,893.20
  6. Step 6: Final answer
    x = 7,174.20

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1.5x scale

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.