Home / 4,220.80-6,320.40-3,119.20

Finding the Fourth Proportional to 4,220.80, 6,320.40 and 3,119.20

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Solution

The fourth proportional to 4,220.80, 6,320.40 and 3,119.20 is: 4,670.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,220.80 : 6,320.40 = 3,119.20 : x
  2. Step 2: Convert to fraction form
    4,220.80/6,320.40 = 3,119.20/x
  3. Step 3: Cross multiply
    4,220.80x = 6,320.40 × 3,119.20
  4. Step 4: Simplify right side
    4,220.80x = 19,714,591.68
  5. Step 5: Solve for x
    x = 19,714,591.68/4,220.80
  6. Step 6: Final answer
    x = 4,670.82

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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.