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Finding the Fourth Proportional to 1,917.27, 2,875.91 and 684.80

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Solution

The fourth proportional to 1,917.27, 2,875.91 and 684.80 is: 1,027.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.27 : 2,875.91 = 684.80 : x
  2. Step 2: Convert to fraction form
    1,917.27/2,875.91 = 684.80/x
  3. Step 3: Cross multiply
    1,917.27x = 2,875.91 × 684.80
  4. Step 4: Simplify right side
    1,917.27x = 1,969,432.33
  5. Step 5: Solve for x
    x = 1,969,432.33/1,917.27
  6. Step 6: Final answer
    x = 1,027.21

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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.