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Finding the Fourth Proportional to 1,398,370.11, 1,929,731.64 and 786,522.68

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Solution

The fourth proportional to 1,398,370.11, 1,929,731.64 and 786,522.68 is: 1,085,390.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398,370.11 : 1,929,731.64 = 786,522.68 : x
  2. Step 2: Convert to fraction form
    1,398,370.11/1,929,731.64 = 786,522.68/x
  3. Step 3: Cross multiply
    1,398,370.11x = 1,929,731.64 × 786,522.68
  4. Step 4: Simplify right side
    1,398,370.11x = 1,517,777,691,524.94
  5. Step 5: Solve for x
    x = 1,517,777,691,524.94/1,398,370.11
  6. Step 6: Final answer
    x = 1,085,390.54

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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.