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Finding the Fourth Proportional to 1,396,699.47, 1,927,383.12 and 815,976.45

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Solution

The fourth proportional to 1,396,699.47, 1,927,383.12 and 815,976.45 is: 1,126,011.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396,699.47 : 1,927,383.12 = 815,976.45 : x
  2. Step 2: Convert to fraction form
    1,396,699.47/1,927,383.12 = 815,976.45/x
  3. Step 3: Cross multiply
    1,396,699.47x = 1,927,383.12 × 815,976.45
  4. Step 4: Simplify right side
    1,396,699.47x = 1,572,699,236,047.52
  5. Step 5: Solve for x
    x = 1,572,699,236,047.52/1,396,699.47
  6. Step 6: Final answer
    x = 1,126,011.19

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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.