Home / 4,221.80-6,321.90-3,120.20

Finding the Fourth Proportional to 4,221.80, 6,321.90 and 3,120.20

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Solution

The fourth proportional to 4,221.80, 6,321.90 and 3,120.20 is: 4,672.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,221.80 : 6,321.90 = 3,120.20 : x
  2. Step 2: Convert to fraction form
    4,221.80/6,321.90 = 3,120.20/x
  3. Step 3: Cross multiply
    4,221.80x = 6,321.90 × 3,120.20
  4. Step 4: Simplify right side
    4,221.80x = 19,725,592.38
  5. Step 5: Solve for x
    x = 19,725,592.38/4,221.80
  6. Step 6: Final answer
    x = 4,672.32

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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.