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Finding the Fourth Proportional to 1,328,598,908.70, 1,992,898,363.05 and 638,339,718.30

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Solution

The fourth proportional to 1,328,598,908.70, 1,992,898,363.05 and 638,339,718.30 is: 957,509,577.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328,598,908.70 : 1,992,898,363.05 = 638,339,718.30 : x
  2. Step 2: Convert to fraction form
    1,328,598,908.70/1,992,898,363.05 = 638,339,718.30/x
  3. Step 3: Cross multiply
    1,328,598,908.70x = 1,992,898,363.05 × 638,339,718.30
  4. Step 4: Simplify right side
    1,328,598,908.70x = 1,272,146,179,669,868,032
  5. Step 5: Solve for x
    x = 1,272,146,179,669,868,032/1,328,598,908.70
  6. Step 6: Final answer
    x = 957,509,577.45

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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.