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Finding the Fourth Proportional to 1,917.90, 2,876.54 and 685.10

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Solution

The fourth proportional to 1,917.90, 2,876.54 and 685.10 is: 1,027.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.90 : 2,876.54 = 685.10 : x
  2. Step 2: Convert to fraction form
    1,917.90/2,876.54 = 685.10/x
  3. Step 3: Cross multiply
    1,917.90x = 2,876.54 × 685.10
  4. Step 4: Simplify right side
    1,917.90x = 1,970,717.55
  5. Step 5: Solve for x
    x = 1,970,717.55/1,917.90
  6. Step 6: Final answer
    x = 1,027.54

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1.5x scale

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.