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Finding the Fourth Proportional to 1,389,978, 1,918,156.68 and 786,366

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Solution

The fourth proportional to 1,389,978, 1,918,156.68 and 786,366 is: 1,085,177.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,978 : 1,918,156.68 = 786,366 : x
  2. Step 2: Convert to fraction form
    1,389,978/1,918,156.68 = 786,366/x
  3. Step 3: Cross multiply
    1,389,978x = 1,918,156.68 × 786,366
  4. Step 4: Simplify right side
    1,389,978x = 1,508,373,195,824.88
  5. Step 5: Solve for x
    x = 1,508,373,195,824.88/1,389,978
  6. Step 6: Final answer
    x = 1,085,177.75

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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.