Home / 5,421.80-8,121.90-3,110.60

Finding the Fourth Proportional to 5,421.80, 8,121.90 and 3,110.60

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Solution

The fourth proportional to 5,421.80, 8,121.90 and 3,110.60 is: 4,659.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.80 : 8,121.90 = 3,110.60 : x
  2. Step 2: Convert to fraction form
    5,421.80/8,121.90 = 3,110.60/x
  3. Step 3: Cross multiply
    5,421.80x = 8,121.90 × 3,110.60
  4. Step 4: Simplify right side
    5,421.80x = 25,263,982.14
  5. Step 5: Solve for x
    x = 25,263,982.14/5,421.80
  6. Step 6: Final answer
    x = 4,659.70

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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.