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Finding the Fourth Proportional to 403.67, 555.39 and 356.21

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Solution

The fourth proportional to 403.67, 555.39 and 356.21 is: 490.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.67 : 555.39 = 356.21 : x
  2. Step 2: Convert to fraction form
    403.67/555.39 = 356.21/x
  3. Step 3: Cross multiply
    403.67x = 555.39 × 356.21
  4. Step 4: Simplify right side
    403.67x = 197,832.30
  5. Step 5: Solve for x
    x = 197,832.30/403.67
  6. Step 6: Final answer
    x = 490.09

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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.