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Finding the Fourth Proportional to 754.80, 1,132.86 and 408.42

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Solution

The fourth proportional to 754.80, 1,132.86 and 408.42 is: 612.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.80 : 1,132.86 = 408.42 : x
  2. Step 2: Convert to fraction form
    754.80/1,132.86 = 408.42/x
  3. Step 3: Cross multiply
    754.80x = 1,132.86 × 408.42
  4. Step 4: Simplify right side
    754.80x = 462,682.68
  5. Step 5: Solve for x
    x = 462,682.68/754.80
  6. Step 6: Final answer
    x = 612.99

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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.