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Finding the Fourth Proportional to 639,440.80, 959,938.80 and 323,735.20

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Solution

The fourth proportional to 639,440.80, 959,938.80 and 323,735.20 is: 485,996.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,440.80 : 959,938.80 = 323,735.20 : x
  2. Step 2: Convert to fraction form
    639,440.80/959,938.80 = 323,735.20/x
  3. Step 3: Cross multiply
    639,440.80x = 959,938.80 × 323,735.20
  4. Step 4: Simplify right side
    639,440.80x = 310,765,979,405.76
  5. Step 5: Solve for x
    x = 310,765,979,405.76/639,440.80
  6. Step 6: Final answer
    x = 485,996.48

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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.