Home / 1,380.30-2,070.18-406.20

Finding the Fourth Proportional to 1,380.30, 2,070.18 and 406.20

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Solution

The fourth proportional to 1,380.30, 2,070.18 and 406.20 is: 609.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.30 : 2,070.18 = 406.20 : x
  2. Step 2: Convert to fraction form
    1,380.30/2,070.18 = 406.20/x
  3. Step 3: Cross multiply
    1,380.30x = 2,070.18 × 406.20
  4. Step 4: Simplify right side
    1,380.30x = 840,907.12
  5. Step 5: Solve for x
    x = 840,907.12/1,380.30
  6. Step 6: Final answer
    x = 609.22

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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.