Home / 20,661.12-30,991.44-5,078.88

Finding the Fourth Proportional to 20,661.12, 30,991.44 and 5,078.88

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Solution

The fourth proportional to 20,661.12, 30,991.44 and 5,078.88 is: 7,618.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.12 : 30,991.44 = 5,078.88 : x
  2. Step 2: Convert to fraction form
    20,661.12/30,991.44 = 5,078.88/x
  3. Step 3: Cross multiply
    20,661.12x = 30,991.44 × 5,078.88
  4. Step 4: Simplify right side
    20,661.12x = 157,401,804.79
  5. Step 5: Solve for x
    x = 157,401,804.79/20,661.12
  6. Step 6: Final answer
    x = 7,618.26

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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.