Home / 7,120.66-9,825.91-3,976.78

Finding the Fourth Proportional to 7,120.66, 9,825.91 and 3,976.78

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Solution

The fourth proportional to 7,120.66, 9,825.91 and 3,976.78 is: 5,487.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.66 : 9,825.91 = 3,976.78 : x
  2. Step 2: Convert to fraction form
    7,120.66/9,825.91 = 3,976.78/x
  3. Step 3: Cross multiply
    7,120.66x = 9,825.91 × 3,976.78
  4. Step 4: Simplify right side
    7,120.66x = 39,075,482.37
  5. Step 5: Solve for x
    x = 39,075,482.37/7,120.66
  6. Step 6: Final answer
    x = 5,487.62

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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.