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Finding the Fourth Proportional to 362,138.80, 543,208.20 and 287,489.20

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Solution

The fourth proportional to 362,138.80, 543,208.20 and 287,489.20 is: 431,233.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    362,138.80 : 543,208.20 = 287,489.20 : x
  2. Step 2: Convert to fraction form
    362,138.80/543,208.20 = 287,489.20/x
  3. Step 3: Cross multiply
    362,138.80x = 543,208.20 × 287,489.20
  4. Step 4: Simplify right side
    362,138.80x = 156,166,490,851.44
  5. Step 5: Solve for x
    x = 156,166,490,851.44/362,138.80
  6. Step 6: Final answer
    x = 431,233.80

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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.