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Finding the Fourth Proportional to 355.55, 490.79 and 318.63

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Solution

The fourth proportional to 355.55, 490.79 and 318.63 is: 439.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.55 : 490.79 = 318.63 : x
  2. Step 2: Convert to fraction form
    355.55/490.79 = 318.63/x
  3. Step 3: Cross multiply
    355.55x = 490.79 × 318.63
  4. Step 4: Simplify right side
    355.55x = 156,378.82
  5. Step 5: Solve for x
    x = 156,378.82/355.55
  6. Step 6: Final answer
    x = 439.83

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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.