Home / 20,211.12-30,315.60-5,419.80

Finding the Fourth Proportional to 20,211.12, 30,315.60 and 5,419.80

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Solution

The fourth proportional to 20,211.12, 30,315.60 and 5,419.80 is: 8,129.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,211.12 : 30,315.60 = 5,419.80 : x
  2. Step 2: Convert to fraction form
    20,211.12/30,315.60 = 5,419.80/x
  3. Step 3: Cross multiply
    20,211.12x = 30,315.60 × 5,419.80
  4. Step 4: Simplify right side
    20,211.12x = 164,304,488.88
  5. Step 5: Solve for x
    x = 164,304,488.88/20,211.12
  6. Step 6: Final answer
    x = 8,129.41

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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.