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Finding the Fourth Proportional to 4,940.90, 7,415.40 and 4,778.90

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Solution

The fourth proportional to 4,940.90, 7,415.40 and 4,778.90 is: 7,172.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,940.90 : 7,415.40 = 4,778.90 : x
  2. Step 2: Convert to fraction form
    4,940.90/7,415.40 = 4,778.90/x
  3. Step 3: Cross multiply
    4,940.90x = 7,415.40 × 4,778.90
  4. Step 4: Simplify right side
    4,940.90x = 35,437,455.06
  5. Step 5: Solve for x
    x = 35,437,455.06/4,940.90
  6. Step 6: Final answer
    x = 7,172.27

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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.