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Finding the Fourth Proportional to 742.92, 1,113.46 and 331.48

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Solution

The fourth proportional to 742.92, 1,113.46 and 331.48 is: 496.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.92 : 1,113.46 = 331.48 : x
  2. Step 2: Convert to fraction form
    742.92/1,113.46 = 331.48/x
  3. Step 3: Cross multiply
    742.92x = 1,113.46 × 331.48
  4. Step 4: Simplify right side
    742.92x = 369,089.72
  5. Step 5: Solve for x
    x = 369,089.72/742.92
  6. Step 6: Final answer
    x = 496.81

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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.