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Finding the Fourth Proportional to 7,018.20, 10,521.90 and 3,940.20

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Solution

The fourth proportional to 7,018.20, 10,521.90 and 3,940.20 is: 5,907.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,018.20 : 10,521.90 = 3,940.20 : x
  2. Step 2: Convert to fraction form
    7,018.20/10,521.90 = 3,940.20/x
  3. Step 3: Cross multiply
    7,018.20x = 10,521.90 × 3,940.20
  4. Step 4: Simplify right side
    7,018.20x = 41,458,390.38
  5. Step 5: Solve for x
    x = 41,458,390.38/7,018.20
  6. Step 6: Final answer
    x = 5,907.27

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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.