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Finding the Fourth Proportional to 742.21, 1,113.42 and 255.13

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Solution

The fourth proportional to 742.21, 1,113.42 and 255.13 is: 382.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.21 : 1,113.42 = 255.13 : x
  2. Step 2: Convert to fraction form
    742.21/1,113.42 = 255.13/x
  3. Step 3: Cross multiply
    742.21x = 1,113.42 × 255.13
  4. Step 4: Simplify right side
    742.21x = 284,060.00
  5. Step 5: Solve for x
    x = 284,060.00/742.21
  6. Step 6: Final answer
    x = 382.72

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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.