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Finding the Fourth Proportional to 1,687.89, 2,329.30 and 941.87

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Solution

The fourth proportional to 1,687.89, 2,329.30 and 941.87 is: 1,299.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.89 : 2,329.30 = 941.87 : x
  2. Step 2: Convert to fraction form
    1,687.89/2,329.30 = 941.87/x
  3. Step 3: Cross multiply
    1,687.89x = 2,329.30 × 941.87
  4. Step 4: Simplify right side
    1,687.89x = 2,193,886.14
  5. Step 5: Solve for x
    x = 2,193,886.14/1,687.89
  6. Step 6: Final answer
    x = 1,299.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.