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Finding the Fourth Proportional to 357.20, 492.90 and 331.08

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Solution

The fourth proportional to 357.20, 492.90 and 331.08 is: 456.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.20 : 492.90 = 331.08 : x
  2. Step 2: Convert to fraction form
    357.20/492.90 = 331.08/x
  3. Step 3: Cross multiply
    357.20x = 492.90 × 331.08
  4. Step 4: Simplify right side
    357.20x = 163,189.33
  5. Step 5: Solve for x
    x = 163,189.33/357.20
  6. Step 6: Final answer
    x = 456.86

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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.