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Finding the Fourth Proportional to 748.55, 1,122.65 and 331.86

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Solution

The fourth proportional to 748.55, 1,122.65 and 331.86 is: 497.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.55 : 1,122.65 = 331.86 : x
  2. Step 2: Convert to fraction form
    748.55/1,122.65 = 331.86/x
  3. Step 3: Cross multiply
    748.55x = 1,122.65 × 331.86
  4. Step 4: Simplify right side
    748.55x = 372,559.25
  5. Step 5: Solve for x
    x = 372,559.25/748.55
  6. Step 6: Final answer
    x = 497.71

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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.