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Finding the Fourth Proportional to 742.10, 1,113.21 and 331.43

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Solution

The fourth proportional to 742.10, 1,113.21 and 331.43 is: 497.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.10 : 1,113.21 = 331.43 : x
  2. Step 2: Convert to fraction form
    742.10/1,113.21 = 331.43/x
  3. Step 3: Cross multiply
    742.10x = 1,113.21 × 331.43
  4. Step 4: Simplify right side
    742.10x = 368,945.62
  5. Step 5: Solve for x
    x = 368,945.62/742.10
  6. Step 6: Final answer
    x = 497.17

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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.