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Finding the Fourth Proportional to 1,917.54, 2,876.40 and 685.53

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Solution

The fourth proportional to 1,917.54, 2,876.40 and 685.53 is: 1,028.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.54 : 2,876.40 = 685.53 : x
  2. Step 2: Convert to fraction form
    1,917.54/2,876.40 = 685.53/x
  3. Step 3: Cross multiply
    1,917.54x = 2,876.40 × 685.53
  4. Step 4: Simplify right side
    1,917.54x = 1,971,858.49
  5. Step 5: Solve for x
    x = 1,971,858.49/1,917.54
  6. Step 6: Final answer
    x = 1,028.33

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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.