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Finding the Fourth Proportional to 1,243.76, 1,861.92 and 755.36

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Solution

The fourth proportional to 1,243.76, 1,861.92 and 755.36 is: 1,130.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.76 : 1,861.92 = 755.36 : x
  2. Step 2: Convert to fraction form
    1,243.76/1,861.92 = 755.36/x
  3. Step 3: Cross multiply
    1,243.76x = 1,861.92 × 755.36
  4. Step 4: Simplify right side
    1,243.76x = 1,406,419.89
  5. Step 5: Solve for x
    x = 1,406,419.89/1,243.76
  6. Step 6: Final answer
    x = 1,130.78

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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.