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Finding the Fourth Proportional to 1,947,772.28, 2,689,649.28 and 1,213,978.92

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Solution

The fourth proportional to 1,947,772.28, 2,689,649.28 and 1,213,978.92 is: 1,676,365.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947,772.28 : 2,689,649.28 = 1,213,978.92 : x
  2. Step 2: Convert to fraction form
    1,947,772.28/2,689,649.28 = 1,213,978.92/x
  3. Step 3: Cross multiply
    1,947,772.28x = 2,689,649.28 × 1,213,978.92
  4. Step 4: Simplify right side
    1,947,772.28x = 3,265,177,528,113.18
  5. Step 5: Solve for x
    x = 3,265,177,528,113.18/1,947,772.28
  6. Step 6: Final answer
    x = 1,676,365.13

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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.