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Finding the Fourth Proportional to 639,441.80, 959,940.30 and 323,736.20

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Solution

The fourth proportional to 639,441.80, 959,940.30 and 323,736.20 is: 485,997.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,441.80 : 959,940.30 = 323,736.20 : x
  2. Step 2: Convert to fraction form
    639,441.80/959,940.30 = 323,736.20/x
  3. Step 3: Cross multiply
    639,441.80x = 959,940.30 × 323,736.20
  4. Step 4: Simplify right side
    639,441.80x = 310,767,424,948.86
  5. Step 5: Solve for x
    x = 310,767,424,948.86/639,441.80
  6. Step 6: Final answer
    x = 485,997.98

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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.