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Finding the Fourth Proportional to 819,995.20, 1,230,223.20 and 399,284.80

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Solution

The fourth proportional to 819,995.20, 1,230,223.20 and 399,284.80 is: 599,039.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,995.20 : 1,230,223.20 = 399,284.80 : x
  2. Step 2: Convert to fraction form
    819,995.20/1,230,223.20 = 399,284.80/x
  3. Step 3: Cross multiply
    819,995.20x = 1,230,223.20 × 399,284.80
  4. Step 4: Simplify right side
    819,995.20x = 491,209,424,367.36
  5. Step 5: Solve for x
    x = 491,209,424,367.36/819,995.20
  6. Step 6: Final answer
    x = 599,039.39

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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.