Home / 7,120.12-9,825.78-3,976.42

Finding the Fourth Proportional to 7,120.12, 9,825.78 and 3,976.42

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Solution

The fourth proportional to 7,120.12, 9,825.78 and 3,976.42 is: 5,487.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.12 : 9,825.78 = 3,976.42 : x
  2. Step 2: Convert to fraction form
    7,120.12/9,825.78 = 3,976.42/x
  3. Step 3: Cross multiply
    7,120.12x = 9,825.78 × 3,976.42
  4. Step 4: Simplify right side
    7,120.12x = 39,071,428.11
  5. Step 5: Solve for x
    x = 39,071,428.11/7,120.12
  6. Step 6: Final answer
    x = 5,487.47

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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.