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Finding the Fourth Proportional to 357.98, 492.90 and 343.20

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Solution

The fourth proportional to 357.98, 492.90 and 343.20 is: 472.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.98 : 492.90 = 343.20 : x
  2. Step 2: Convert to fraction form
    357.98/492.90 = 343.20/x
  3. Step 3: Cross multiply
    357.98x = 492.90 × 343.20
  4. Step 4: Simplify right side
    357.98x = 169,164.43
  5. Step 5: Solve for x
    x = 169,164.43/357.98
  6. Step 6: Final answer
    x = 472.56

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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.