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Finding the Fourth Proportional to 742.35, 1,113.90 and 331.44

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Solution

The fourth proportional to 742.35, 1,113.90 and 331.44 is: 497.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.35 : 1,113.90 = 331.44 : x
  2. Step 2: Convert to fraction form
    742.35/1,113.90 = 331.44/x
  3. Step 3: Cross multiply
    742.35x = 1,113.90 × 331.44
  4. Step 4: Simplify right side
    742.35x = 369,191.02
  5. Step 5: Solve for x
    x = 369,191.02/742.35
  6. Step 6: Final answer
    x = 497.33

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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.