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Finding the Fourth Proportional to 1,328,598,919.20, 1,992,898,378.80 and 638,339,728.80

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Solution

The fourth proportional to 1,328,598,919.20, 1,992,898,378.80 and 638,339,728.80 is: 957,509,593.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328,598,919.20 : 1,992,898,378.80 = 638,339,728.80 : x
  2. Step 2: Convert to fraction form
    1,328,598,919.20/1,992,898,378.80 = 638,339,728.80/x
  3. Step 3: Cross multiply
    1,328,598,919.20x = 1,992,898,378.80 × 638,339,728.80
  4. Step 4: Simplify right side
    1,328,598,919.20x = 1,272,146,210,649,151,488
  5. Step 5: Solve for x
    x = 1,272,146,210,649,151,488/1,328,598,919.20
  6. Step 6: Final answer
    x = 957,509,593.20

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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.