Home / 7,112.99-9,816.91-3,969.38

Finding the Fourth Proportional to 7,112.99, 9,816.91 and 3,969.38

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Solution

The fourth proportional to 7,112.99, 9,816.91 and 3,969.38 is: 5,478.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,112.99 : 9,816.91 = 3,969.38 : x
  2. Step 2: Convert to fraction form
    7,112.99/9,816.91 = 3,969.38/x
  3. Step 3: Cross multiply
    7,112.99x = 9,816.91 × 3,969.38
  4. Step 4: Simplify right side
    7,112.99x = 38,966,987.21
  5. Step 5: Solve for x
    x = 38,966,987.21/7,112.99
  6. Step 6: Final answer
    x = 5,478.29

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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.