Home / 3,875.20-5,812.80-2,125.60

Finding the Fourth Proportional to 3,875.20, 5,812.80 and 2,125.60

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Solution

The fourth proportional to 3,875.20, 5,812.80 and 2,125.60 is: 3,188.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,875.20 : 5,812.80 = 2,125.60 : x
  2. Step 2: Convert to fraction form
    3,875.20/5,812.80 = 2,125.60/x
  3. Step 3: Cross multiply
    3,875.20x = 5,812.80 × 2,125.60
  4. Step 4: Simplify right side
    3,875.20x = 12,355,687.68
  5. Step 5: Solve for x
    x = 12,355,687.68/3,875.20
  6. Step 6: Final answer
    x = 3,188.40

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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.