Home / 1,380.20-2,070.38-406.44

Finding the Fourth Proportional to 1,380.20, 2,070.38 and 406.44

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Solution

The fourth proportional to 1,380.20, 2,070.38 and 406.44 is: 609.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.20 : 2,070.38 = 406.44 : x
  2. Step 2: Convert to fraction form
    1,380.20/2,070.38 = 406.44/x
  3. Step 3: Cross multiply
    1,380.20x = 2,070.38 × 406.44
  4. Step 4: Simplify right side
    1,380.20x = 841,485.25
  5. Step 5: Solve for x
    x = 841,485.25/1,380.20
  6. Step 6: Final answer
    x = 609.68

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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.