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Finding the Fourth Proportional to 1,279,209,843.80, 1,920,249,656.40 and 989,361,922.40

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Solution

The fourth proportional to 1,279,209,843.80, 1,920,249,656.40 and 989,361,922.40 is: 1,485,152,651.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279,209,843.80 : 1,920,249,656.40 = 989,361,922.40 : x
  2. Step 2: Convert to fraction form
    1,279,209,843.80/1,920,249,656.40 = 989,361,922.40/x
  3. Step 3: Cross multiply
    1,279,209,843.80x = 1,920,249,656.40 × 989,361,922.40
  4. Step 4: Simplify right side
    1,279,209,843.80x = 1,899,821,891,543,843,584
  5. Step 5: Solve for x
    x = 1,899,821,891,543,843,584/1,279,209,843.80
  6. Step 6: Final answer
    x = 1,485,152,651.66

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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.