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Finding the Fourth Proportional to 356.54, 491.22 and 245.86

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Solution

The fourth proportional to 356.54, 491.22 and 245.86 is: 338.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.54 : 491.22 = 245.86 : x
  2. Step 2: Convert to fraction form
    356.54/491.22 = 245.86/x
  3. Step 3: Cross multiply
    356.54x = 491.22 × 245.86
  4. Step 4: Simplify right side
    356.54x = 120,770.12
  5. Step 5: Solve for x
    x = 120,770.12/356.54
  6. Step 6: Final answer
    x = 338.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.