Home / 5,420.80-8,121.60-4,806.40

Finding the Fourth Proportional to 5,420.80, 8,121.60 and 4,806.40

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Solution

The fourth proportional to 5,420.80, 8,121.60 and 4,806.40 is: 7,201.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.80 : 8,121.60 = 4,806.40 : x
  2. Step 2: Convert to fraction form
    5,420.80/8,121.60 = 4,806.40/x
  3. Step 3: Cross multiply
    5,420.80x = 8,121.60 × 4,806.40
  4. Step 4: Simplify right side
    5,420.80x = 39,035,658.24
  5. Step 5: Solve for x
    x = 39,035,658.24/5,420.80
  6. Step 6: Final answer
    x = 7,201.09

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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.