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Finding the Fourth Proportional to 1,388,983.90, 1,916,872.01 and 777,100.03

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Solution

The fourth proportional to 1,388,983.90, 1,916,872.01 and 777,100.03 is: 1,072,439.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,983.90 : 1,916,872.01 = 777,100.03 : x
  2. Step 2: Convert to fraction form
    1,388,983.90/1,916,872.01 = 777,100.03/x
  3. Step 3: Cross multiply
    1,388,983.90x = 1,916,872.01 × 777,100.03
  4. Step 4: Simplify right side
    1,388,983.90x = 1,489,601,292,899.20
  5. Step 5: Solve for x
    x = 1,489,601,292,899.20/1,388,983.90
  6. Step 6: Final answer
    x = 1,072,439.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.