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Finding the Fourth Proportional to 940.28, 1,407.92 and 755.60

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Solution

The fourth proportional to 940.28, 1,407.92 and 755.60 is: 1,131.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.28 : 1,407.92 = 755.60 : x
  2. Step 2: Convert to fraction form
    940.28/1,407.92 = 755.60/x
  3. Step 3: Cross multiply
    940.28x = 1,407.92 × 755.60
  4. Step 4: Simplify right side
    940.28x = 1,063,813.53
  5. Step 5: Solve for x
    x = 1,063,813.53/940.28
  6. Step 6: Final answer
    x = 1,131.39

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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.