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Finding the Fourth Proportional to 1,391,932.66, 1,920,835.08 and 811,118.80

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Solution

The fourth proportional to 1,391,932.66, 1,920,835.08 and 811,118.80 is: 1,119,325.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,932.66 : 1,920,835.08 = 811,118.80 : x
  2. Step 2: Convert to fraction form
    1,391,932.66/1,920,835.08 = 811,118.80/x
  3. Step 3: Cross multiply
    1,391,932.66x = 1,920,835.08 × 811,118.80
  4. Step 4: Simplify right side
    1,391,932.66x = 1,558,025,445,087.50
  5. Step 5: Solve for x
    x = 1,558,025,445,087.50/1,391,932.66
  6. Step 6: Final answer
    x = 1,119,325.30

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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.