Home / 639,705.20-959,687.40-219,023.60

Finding the Fourth Proportional to 639,705.20, 959,687.40 and 219,023.60

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Solution

The fourth proportional to 639,705.20, 959,687.40 and 219,023.60 is: 328,579.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,705.20 : 959,687.40 = 219,023.60 : x
  2. Step 2: Convert to fraction form
    639,705.20/959,687.40 = 219,023.60/x
  3. Step 3: Cross multiply
    639,705.20x = 959,687.40 × 219,023.60
  4. Step 4: Simplify right side
    639,705.20x = 210,194,189,222.64
  5. Step 5: Solve for x
    x = 210,194,189,222.64/639,705.20
  6. Step 6: Final answer
    x = 328,579.77

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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.