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Finding the Fourth Proportional to 331.92, 499.86 and 291.78

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Solution

The fourth proportional to 331.92, 499.86 and 291.78 is: 439.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.92 : 499.86 = 291.78 : x
  2. Step 2: Convert to fraction form
    331.92/499.86 = 291.78/x
  3. Step 3: Cross multiply
    331.92x = 499.86 × 291.78
  4. Step 4: Simplify right side
    331.92x = 145,849.15
  5. Step 5: Solve for x
    x = 145,849.15/331.92
  6. Step 6: Final answer
    x = 439.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.