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Finding the Fourth Proportional to 1,391,742.28, 1,920,571.72 and 818,819.28

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Solution

The fourth proportional to 1,391,742.28, 1,920,571.72 and 818,819.28 is: 1,129,951.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,742.28 : 1,920,571.72 = 818,819.28 : x
  2. Step 2: Convert to fraction form
    1,391,742.28/1,920,571.72 = 818,819.28/x
  3. Step 3: Cross multiply
    1,391,742.28x = 1,920,571.72 × 818,819.28
  4. Step 4: Simplify right side
    1,391,742.28x = 1,572,601,152,958.76
  5. Step 5: Solve for x
    x = 1,572,601,152,958.76/1,391,742.28
  6. Step 6: Final answer
    x = 1,129,951.41

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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.