Home / 7,122.75-9,830.61-3,978.33

Finding the Fourth Proportional to 7,122.75, 9,830.61 and 3,978.33

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Solution

The fourth proportional to 7,122.75, 9,830.61 and 3,978.33 is: 5,490.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.75 : 9,830.61 = 3,978.33 : x
  2. Step 2: Convert to fraction form
    7,122.75/9,830.61 = 3,978.33/x
  3. Step 3: Cross multiply
    7,122.75x = 9,830.61 × 3,978.33
  4. Step 4: Simplify right side
    7,122.75x = 39,109,410.68
  5. Step 5: Solve for x
    x = 39,109,410.68/7,122.75
  6. Step 6: Final answer
    x = 5,490.77

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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.