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Finding the Fourth Proportional to 1,840.75, 2,761.26 and 686.50

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Solution

The fourth proportional to 1,840.75, 2,761.26 and 686.50 is: 1,029.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,840.75 : 2,761.26 = 686.50 : x
  2. Step 2: Convert to fraction form
    1,840.75/2,761.26 = 686.50/x
  3. Step 3: Cross multiply
    1,840.75x = 2,761.26 × 686.50
  4. Step 4: Simplify right side
    1,840.75x = 1,895,604.99
  5. Step 5: Solve for x
    x = 1,895,604.99/1,840.75
  6. Step 6: Final answer
    x = 1,029.80

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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.