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Finding the Fourth Proportional to 398,731.20, 598,423.20 and 395,620.80

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Solution

The fourth proportional to 398,731.20, 598,423.20 and 395,620.80 is: 593,755.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,731.20 : 598,423.20 = 395,620.80 : x
  2. Step 2: Convert to fraction form
    398,731.20/598,423.20 = 395,620.80/x
  3. Step 3: Cross multiply
    398,731.20x = 598,423.20 × 395,620.80
  4. Step 4: Simplify right side
    398,731.20x = 236,748,665,122.56
  5. Step 5: Solve for x
    x = 236,748,665,122.56/398,731.20
  6. Step 6: Final answer
    x = 593,755.05

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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.