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Finding the Fourth Proportional to 742.75, 1,113.82 and 331.81

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Solution

The fourth proportional to 742.75, 1,113.82 and 331.81 is: 497.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.75 : 1,113.82 = 331.81 : x
  2. Step 2: Convert to fraction form
    742.75/1,113.82 = 331.81/x
  3. Step 3: Cross multiply
    742.75x = 1,113.82 × 331.81
  4. Step 4: Simplify right side
    742.75x = 369,573.00
  5. Step 5: Solve for x
    x = 369,573.00/742.75
  6. Step 6: Final answer
    x = 497.58

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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.