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Finding the Fourth Proportional to 742.57, 1,113.89 and 255.63

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Solution

The fourth proportional to 742.57, 1,113.89 and 255.63 is: 383.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.57 : 1,113.89 = 255.63 : x
  2. Step 2: Convert to fraction form
    742.57/1,113.89 = 255.63/x
  3. Step 3: Cross multiply
    742.57x = 1,113.89 × 255.63
  4. Step 4: Simplify right side
    742.57x = 284,743.70
  5. Step 5: Solve for x
    x = 284,743.70/742.57
  6. Step 6: Final answer
    x = 383.46

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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.