Home / 5,620.80-8,431.20-5,145.60

Finding the Fourth Proportional to 5,620.80, 8,431.20 and 5,145.60

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Solution

The fourth proportional to 5,620.80, 8,431.20 and 5,145.60 is: 7,718.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,620.80 : 8,431.20 = 5,145.60 : x
  2. Step 2: Convert to fraction form
    5,620.80/8,431.20 = 5,145.60/x
  3. Step 3: Cross multiply
    5,620.80x = 8,431.20 × 5,145.60
  4. Step 4: Simplify right side
    5,620.80x = 43,383,582.72
  5. Step 5: Solve for x
    x = 43,383,582.72/5,620.80
  6. Step 6: Final answer
    x = 7,718.40

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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.