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Finding the Fourth Proportional to 1,291,893.76, 1,782,892 and 718,933.92

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Solution

The fourth proportional to 1,291,893.76, 1,782,892 and 718,933.92 is: 992,172.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291,893.76 : 1,782,892 = 718,933.92 : x
  2. Step 2: Convert to fraction form
    1,291,893.76/1,782,892 = 718,933.92/x
  3. Step 3: Cross multiply
    1,291,893.76x = 1,782,892 × 718,933.92
  4. Step 4: Simplify right side
    1,291,893.76x = 1,281,781,534,496.64
  5. Step 5: Solve for x
    x = 1,281,781,534,496.64/1,291,893.76
  6. Step 6: Final answer
    x = 992,172.56

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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.