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Finding the Fourth Proportional to 1,917.92, 2,877.06 and 685.46

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Solution

The fourth proportional to 1,917.92, 2,877.06 and 685.46 is: 1,028.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.92 : 2,877.06 = 685.46 : x
  2. Step 2: Convert to fraction form
    1,917.92/2,877.06 = 685.46/x
  3. Step 3: Cross multiply
    1,917.92x = 2,877.06 × 685.46
  4. Step 4: Simplify right side
    1,917.92x = 1,972,109.55
  5. Step 5: Solve for x
    x = 1,972,109.55/1,917.92
  6. Step 6: Final answer
    x = 1,028.25

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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.