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Finding the Fourth Proportional to 328,540.80, 492,811.20 and 285,238.20

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Solution

The fourth proportional to 328,540.80, 492,811.20 and 285,238.20 is: 427,857.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,540.80 : 492,811.20 = 285,238.20 : x
  2. Step 2: Convert to fraction form
    328,540.80/492,811.20 = 285,238.20/x
  3. Step 3: Cross multiply
    328,540.80x = 492,811.20 × 285,238.20
  4. Step 4: Simplify right side
    328,540.80x = 140,568,579,627.84
  5. Step 5: Solve for x
    x = 140,568,579,627.84/328,540.80
  6. Step 6: Final answer
    x = 427,857.30

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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.