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Finding the Fourth Proportional to 1,914.80, 2,872.47 and 682.11

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Solution

The fourth proportional to 1,914.80, 2,872.47 and 682.11 is: 1,023.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,914.80 : 2,872.47 = 682.11 : x
  2. Step 2: Convert to fraction form
    1,914.80/2,872.47 = 682.11/x
  3. Step 3: Cross multiply
    1,914.80x = 2,872.47 × 682.11
  4. Step 4: Simplify right side
    1,914.80x = 1,959,340.51
  5. Step 5: Solve for x
    x = 1,959,340.51/1,914.80
  6. Step 6: Final answer
    x = 1,023.26

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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.