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Finding the Fourth Proportional to 355.59, 490.90 and 231.32

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Solution

The fourth proportional to 355.59, 490.90 and 231.32 is: 319.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.59 : 490.90 = 231.32 : x
  2. Step 2: Convert to fraction form
    355.59/490.90 = 231.32/x
  3. Step 3: Cross multiply
    355.59x = 490.90 × 231.32
  4. Step 4: Simplify right side
    355.59x = 113,554.99
  5. Step 5: Solve for x
    x = 113,554.99/355.59
  6. Step 6: Final answer
    x = 319.34

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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.