Home / 1,989,390.69-2,981,040.30-1,338,556.20

Finding the Fourth Proportional to 1,989,390.69, 2,981,040.30 and 1,338,556.20

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Solution

The fourth proportional to 1,989,390.69, 2,981,040.30 and 1,338,556.20 is: 2,005,784.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989,390.69 : 2,981,040.30 = 1,338,556.20 : x
  2. Step 2: Convert to fraction form
    1,989,390.69/2,981,040.30 = 1,338,556.20/x
  3. Step 3: Cross multiply
    1,989,390.69x = 2,981,040.30 × 1,338,556.20
  4. Step 4: Simplify right side
    1,989,390.69x = 3,990,289,976,014.86
  5. Step 5: Solve for x
    x = 3,990,289,976,014.86/1,989,390.69
  6. Step 6: Final answer
    x = 2,005,784.99

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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.