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Finding the Fourth Proportional to 1,917.73, 2,876.98 and 685.11

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Solution

The fourth proportional to 1,917.73, 2,876.98 and 685.11 is: 1,027.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.73 : 2,876.98 = 685.11 : x
  2. Step 2: Convert to fraction form
    1,917.73/2,876.98 = 685.11/x
  3. Step 3: Cross multiply
    1,917.73x = 2,876.98 × 685.11
  4. Step 4: Simplify right side
    1,917.73x = 1,971,047.77
  5. Step 5: Solve for x
    x = 1,971,047.77/1,917.73
  6. Step 6: Final answer
    x = 1,027.80

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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.