Home / 5,119.97-7,679.16-1,421.80

Finding the Fourth Proportional to 5,119.97, 7,679.16 and 1,421.80

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Solution

The fourth proportional to 5,119.97, 7,679.16 and 1,421.80 is: 2,132.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,119.97 : 7,679.16 = 1,421.80 : x
  2. Step 2: Convert to fraction form
    5,119.97/7,679.16 = 1,421.80/x
  3. Step 3: Cross multiply
    5,119.97x = 7,679.16 × 1,421.80
  4. Step 4: Simplify right side
    5,119.97x = 10,918,210.49
  5. Step 5: Solve for x
    x = 10,918,210.49/5,119.97
  6. Step 6: Final answer
    x = 2,132.48

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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.