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Finding the Fourth Proportional to 1,380.03, 2,070.05 and 406.82

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Solution

The fourth proportional to 1,380.03, 2,070.05 and 406.82 is: 610.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.03 : 2,070.05 = 406.82 : x
  2. Step 2: Convert to fraction form
    1,380.03/2,070.05 = 406.82/x
  3. Step 3: Cross multiply
    1,380.03x = 2,070.05 × 406.82
  4. Step 4: Simplify right side
    1,380.03x = 842,137.74
  5. Step 5: Solve for x
    x = 842,137.74/1,380.03
  6. Step 6: Final answer
    x = 610.23

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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.