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Finding the Fourth Proportional to 1,388,858.57, 1,916,699.29 and 776,974.85

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Solution

The fourth proportional to 1,388,858.57, 1,916,699.29 and 776,974.85 is: 1,072,266.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,858.57 : 1,916,699.29 = 776,974.85 : x
  2. Step 2: Convert to fraction form
    1,388,858.57/1,916,699.29 = 776,974.85/x
  3. Step 3: Cross multiply
    1,388,858.57x = 1,916,699.29 × 776,974.85
  4. Step 4: Simplify right side
    1,388,858.57x = 1,489,227,139,004.55
  5. Step 5: Solve for x
    x = 1,489,227,139,004.55/1,388,858.57
  6. Step 6: Final answer
    x = 1,072,266.95

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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.