Home / 5,419.89-8,129.81-1,909.08

Finding the Fourth Proportional to 5,419.89, 8,129.81 and 1,909.08

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Solution

The fourth proportional to 5,419.89, 8,129.81 and 1,909.08 is: 2,863.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,419.89 : 8,129.81 = 1,909.08 : x
  2. Step 2: Convert to fraction form
    5,419.89/8,129.81 = 1,909.08/x
  3. Step 3: Cross multiply
    5,419.89x = 8,129.81 × 1,909.08
  4. Step 4: Simplify right side
    5,419.89x = 15,520,448.13
  5. Step 5: Solve for x
    x = 15,520,448.13/5,419.89
  6. Step 6: Final answer
    x = 2,863.61

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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.