Home / 5,119.57-7,679.90-1,421.81

Finding the Fourth Proportional to 5,119.57, 7,679.90 and 1,421.81

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Solution

The fourth proportional to 5,119.57, 7,679.90 and 1,421.81 is: 2,132.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,119.57 : 7,679.90 = 1,421.81 : x
  2. Step 2: Convert to fraction form
    5,119.57/7,679.90 = 1,421.81/x
  3. Step 3: Cross multiply
    5,119.57x = 7,679.90 × 1,421.81
  4. Step 4: Simplify right side
    5,119.57x = 10,919,352.57
  5. Step 5: Solve for x
    x = 10,919,352.57/5,119.57
  6. Step 6: Final answer
    x = 2,132.86

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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.