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Finding the Fourth Proportional to 3,603.80, 5,405.70 and 2,826.20

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Solution

The fourth proportional to 3,603.80, 5,405.70 and 2,826.20 is: 4,239.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,603.80 : 5,405.70 = 2,826.20 : x
  2. Step 2: Convert to fraction form
    3,603.80/5,405.70 = 2,826.20/x
  3. Step 3: Cross multiply
    3,603.80x = 5,405.70 × 2,826.20
  4. Step 4: Simplify right side
    3,603.80x = 15,277,589.34
  5. Step 5: Solve for x
    x = 15,277,589.34/3,603.80
  6. Step 6: Final answer
    x = 4,239.30

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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.