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Finding the Fourth Proportional to 1,391,881.12, 1,920,705 and 818,810.56

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Solution

The fourth proportional to 1,391,881.12, 1,920,705 and 818,810.56 is: 1,129,905.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,881.12 : 1,920,705 = 818,810.56 : x
  2. Step 2: Convert to fraction form
    1,391,881.12/1,920,705 = 818,810.56/x
  3. Step 3: Cross multiply
    1,391,881.12x = 1,920,705 × 818,810.56
  4. Step 4: Simplify right side
    1,391,881.12x = 1,572,693,536,644.80
  5. Step 5: Solve for x
    x = 1,572,693,536,644.80/1,391,881.12
  6. Step 6: Final answer
    x = 1,129,905.07

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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.