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Finding the Fourth Proportional to 403.73, 553.51 and 396.44

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Solution

The fourth proportional to 403.73, 553.51 and 396.44 is: 543.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.73 : 553.51 = 396.44 : x
  2. Step 2: Convert to fraction form
    403.73/553.51 = 396.44/x
  3. Step 3: Cross multiply
    403.73x = 553.51 × 396.44
  4. Step 4: Simplify right side
    403.73x = 219,430.74
  5. Step 5: Solve for x
    x = 219,430.74/403.73
  6. Step 6: Final answer
    x = 543.52

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.