Home / 5,120.90-7,066.92-3,131.03

Finding the Fourth Proportional to 5,120.90, 7,066.92 and 3,131.03

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Solution

The fourth proportional to 5,120.90, 7,066.92 and 3,131.03 is: 4,320.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.90 : 7,066.92 = 3,131.03 : x
  2. Step 2: Convert to fraction form
    5,120.90/7,066.92 = 3,131.03/x
  3. Step 3: Cross multiply
    5,120.90x = 7,066.92 × 3,131.03
  4. Step 4: Simplify right side
    5,120.90x = 22,126,738.53
  5. Step 5: Solve for x
    x = 22,126,738.53/5,120.90
  6. Step 6: Final answer
    x = 4,320.87

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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.