Home / 1,290,300,419.20-1,934,211,998.40-428,213,660.80

Finding the Fourth Proportional to 1,290,300,419.20, 1,934,211,998.40 and 428,213,660.80

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Solution

The fourth proportional to 1,290,300,419.20, 1,934,211,998.40 and 428,213,660.80 is: 641,909,425.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,300,419.20 : 1,934,211,998.40 = 428,213,660.80 : x
  2. Step 2: Convert to fraction form
    1,290,300,419.20/1,934,211,998.40 = 428,213,660.80/x
  3. Step 3: Cross multiply
    1,290,300,419.20x = 1,934,211,998.40 × 428,213,660.80
  4. Step 4: Simplify right side
    1,290,300,419.20x = 828,256,000,598,147,840
  5. Step 5: Solve for x
    x = 828,256,000,598,147,840/1,290,300,419.20
  6. Step 6: Final answer
    x = 641,909,425.33

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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.