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Finding the Fourth Proportional to 1,405,343.04, 1,939,603.04 and 861,778

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Solution

The fourth proportional to 1,405,343.04, 1,939,603.04 and 861,778 is: 1,189,394.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,343.04 : 1,939,603.04 = 861,778 : x
  2. Step 2: Convert to fraction form
    1,405,343.04/1,939,603.04 = 861,778/x
  3. Step 3: Cross multiply
    1,405,343.04x = 1,939,603.04 × 861,778
  4. Step 4: Simplify right side
    1,405,343.04x = 1,671,507,228,605.12
  5. Step 5: Solve for x
    x = 1,671,507,228,605.12/1,405,343.04
  6. Step 6: Final answer
    x = 1,189,394.46

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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.