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Finding the Fourth Proportional to 398,647,320.40, 597,970,980.60 and 395,959,934.80

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Solution

The fourth proportional to 398,647,320.40, 597,970,980.60 and 395,959,934.80 is: 593,939,902.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,647,320.40 : 597,970,980.60 = 395,959,934.80 : x
  2. Step 2: Convert to fraction form
    398,647,320.40/597,970,980.60 = 395,959,934.80/x
  3. Step 3: Cross multiply
    398,647,320.40x = 597,970,980.60 × 395,959,934.80
  4. Step 4: Simplify right side
    398,647,320.40x = 236,772,550,490,668,096
  5. Step 5: Solve for x
    x = 236,772,550,490,668,096/398,647,320.40
  6. Step 6: Final answer
    x = 593,939,902.20

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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.