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Finding the Fourth Proportional to 403.80, 557.42 and 330.90

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Solution

The fourth proportional to 403.80, 557.42 and 330.90 is: 456.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.80 : 557.42 = 330.90 : x
  2. Step 2: Convert to fraction form
    403.80/557.42 = 330.90/x
  3. Step 3: Cross multiply
    403.80x = 557.42 × 330.90
  4. Step 4: Simplify right side
    403.80x = 184,450.28
  5. Step 5: Solve for x
    x = 184,450.28/403.80
  6. Step 6: Final answer
    x = 456.79

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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.