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Finding the Fourth Proportional to 2,123.45, 3,185.17 and 736.78

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Solution

The fourth proportional to 2,123.45, 3,185.17 and 736.78 is: 1,105.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,123.45 : 3,185.17 = 736.78 : x
  2. Step 2: Convert to fraction form
    2,123.45/3,185.17 = 736.78/x
  3. Step 3: Cross multiply
    2,123.45x = 3,185.17 × 736.78
  4. Step 4: Simplify right side
    2,123.45x = 2,346,779.36
  5. Step 5: Solve for x
    x = 2,346,779.36/2,123.45
  6. Step 6: Final answer
    x = 1,105.18

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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.