Home / 4,287.60-6,431.40-3,121.20

Finding the Fourth Proportional to 4,287.60, 6,431.40 and 3,121.20

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Solution

The fourth proportional to 4,287.60, 6,431.40 and 3,121.20 is: 4,681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,287.60 : 6,431.40 = 3,121.20 : x
  2. Step 2: Convert to fraction form
    4,287.60/6,431.40 = 3,121.20/x
  3. Step 3: Cross multiply
    4,287.60x = 6,431.40 × 3,121.20
  4. Step 4: Simplify right side
    4,287.60x = 20,073,685.68
  5. Step 5: Solve for x
    x = 20,073,685.68/4,287.60
  6. Step 6: Final answer
    x = 4,681.80

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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.