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Finding the Fourth Proportional to 355.68, 490.19 and 311.33

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Solution

The fourth proportional to 355.68, 490.19 and 311.33 is: 429.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.68 : 490.19 = 311.33 : x
  2. Step 2: Convert to fraction form
    355.68/490.19 = 311.33/x
  3. Step 3: Cross multiply
    355.68x = 490.19 × 311.33
  4. Step 4: Simplify right side
    355.68x = 152,610.52
  5. Step 5: Solve for x
    x = 152,610.52/355.68
  6. Step 6: Final answer
    x = 429.07

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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.