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Finding the Fourth Proportional to 1,917.61, 2,876.34 and 619.12

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Solution

The fourth proportional to 1,917.61, 2,876.34 and 619.12 is: 928.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.61 : 2,876.34 = 619.12 : x
  2. Step 2: Convert to fraction form
    1,917.61/2,876.34 = 619.12/x
  3. Step 3: Cross multiply
    1,917.61x = 2,876.34 × 619.12
  4. Step 4: Simplify right side
    1,917.61x = 1,780,799.62
  5. Step 5: Solve for x
    x = 1,780,799.62/1,917.61
  6. Step 6: Final answer
    x = 928.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.