Home / 2,175.20-3,000.41-1,290.38

Finding the Fourth Proportional to 2,175.20, 3,000.41 and 1,290.38

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Solution

The fourth proportional to 2,175.20, 3,000.41 and 1,290.38 is: 1,779.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,175.20 : 3,000.41 = 1,290.38 : x
  2. Step 2: Convert to fraction form
    2,175.20/3,000.41 = 1,290.38/x
  3. Step 3: Cross multiply
    2,175.20x = 3,000.41 × 1,290.38
  4. Step 4: Simplify right side
    2,175.20x = 3,871,650.83
  5. Step 5: Solve for x
    x = 3,871,650.83/2,175.20
  6. Step 6: Final answer
    x = 1,779.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.