Home / 3,428.80-5,143.20-1,120.30

Finding the Fourth Proportional to 3,428.80, 5,143.20 and 1,120.30

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Solution

The fourth proportional to 3,428.80, 5,143.20 and 1,120.30 is: 1,680.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,428.80 : 5,143.20 = 1,120.30 : x
  2. Step 2: Convert to fraction form
    3,428.80/5,143.20 = 1,120.30/x
  3. Step 3: Cross multiply
    3,428.80x = 5,143.20 × 1,120.30
  4. Step 4: Simplify right side
    3,428.80x = 5,761,926.96
  5. Step 5: Solve for x
    x = 5,761,926.96/3,428.80
  6. Step 6: Final answer
    x = 1,680.45

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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.