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Finding the Fourth Proportional to 431,998.80, 647,998.20 and 388,453.20

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Solution

The fourth proportional to 431,998.80, 647,998.20 and 388,453.20 is: 582,679.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,998.80 : 647,998.20 = 388,453.20 : x
  2. Step 2: Convert to fraction form
    431,998.80/647,998.20 = 388,453.20/x
  3. Step 3: Cross multiply
    431,998.80x = 647,998.20 × 388,453.20
  4. Step 4: Simplify right side
    431,998.80x = 251,716,974,384.24
  5. Step 5: Solve for x
    x = 251,716,974,384.24/431,998.80
  6. Step 6: Final answer
    x = 582,679.80

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Similar ratio
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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.