Home / 8,210.40-12,315.60-3,280.80

Finding the Fourth Proportional to 8,210.40, 12,315.60 and 3,280.80

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Solution

The fourth proportional to 8,210.40, 12,315.60 and 3,280.80 is: 4,921.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,210.40 : 12,315.60 = 3,280.80 : x
  2. Step 2: Convert to fraction form
    8,210.40/12,315.60 = 3,280.80/x
  3. Step 3: Cross multiply
    8,210.40x = 12,315.60 × 3,280.80
  4. Step 4: Simplify right side
    8,210.40x = 40,405,020.48
  5. Step 5: Solve for x
    x = 40,405,020.48/8,210.40
  6. Step 6: Final answer
    x = 4,921.20

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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.