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Finding the Fourth Proportional to 755.89, 1,135.85 and 409.48

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Solution

The fourth proportional to 755.89, 1,135.85 and 409.48 is: 615.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.89 : 1,135.85 = 409.48 : x
  2. Step 2: Convert to fraction form
    755.89/1,135.85 = 409.48/x
  3. Step 3: Cross multiply
    755.89x = 1,135.85 × 409.48
  4. Step 4: Simplify right side
    755.89x = 465,107.86
  5. Step 5: Solve for x
    x = 465,107.86/755.89
  6. Step 6: Final answer
    x = 615.31

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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.