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Finding the Fourth Proportional to 1,296,432.72, 1,789,865.64 and 889,203.60

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Solution

The fourth proportional to 1,296,432.72, 1,789,865.64 and 889,203.60 is: 1,227,641.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296,432.72 : 1,789,865.64 = 889,203.60 : x
  2. Step 2: Convert to fraction form
    1,296,432.72/1,789,865.64 = 889,203.60/x
  3. Step 3: Cross multiply
    1,296,432.72x = 1,789,865.64 × 889,203.60
  4. Step 4: Simplify right side
    1,296,432.72x = 1,591,554,970,604.30
  5. Step 5: Solve for x
    x = 1,591,554,970,604.30/1,296,432.72
  6. Step 6: Final answer
    x = 1,227,641.78

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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.