Home / 427,308,980.20-640,963,470.30-279,355,805.80

Finding the Fourth Proportional to 427,308,980.20, 640,963,470.30 and 279,355,805.80

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Solution

The fourth proportional to 427,308,980.20, 640,963,470.30 and 279,355,805.80 is: 419,033,708.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,308,980.20 : 640,963,470.30 = 279,355,805.80 : x
  2. Step 2: Convert to fraction form
    427,308,980.20/640,963,470.30 = 279,355,805.80/x
  3. Step 3: Cross multiply
    427,308,980.20x = 640,963,470.30 × 279,355,805.80
  4. Step 4: Simplify right side
    427,308,980.20x = 179,056,866,734,020,864
  5. Step 5: Solve for x
    x = 179,056,866,734,020,864/427,308,980.20
  6. Step 6: Final answer
    x = 419,033,708.70

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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.