Home / 2,155.80-3,228.30-1,421.40

Finding the Fourth Proportional to 2,155.80, 3,228.30 and 1,421.40

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Solution

The fourth proportional to 2,155.80, 3,228.30 and 1,421.40 is: 2,128.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.80 : 3,228.30 = 1,421.40 : x
  2. Step 2: Convert to fraction form
    2,155.80/3,228.30 = 1,421.40/x
  3. Step 3: Cross multiply
    2,155.80x = 3,228.30 × 1,421.40
  4. Step 4: Simplify right side
    2,155.80x = 4,588,705.62
  5. Step 5: Solve for x
    x = 4,588,705.62/2,155.80
  6. Step 6: Final answer
    x = 2,128.54

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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.