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Finding the Fourth Proportional to 403.96, 557.82 and 311.62

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Solution

The fourth proportional to 403.96, 557.82 and 311.62 is: 430.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.96 : 557.82 = 311.62 : x
  2. Step 2: Convert to fraction form
    403.96/557.82 = 311.62/x
  3. Step 3: Cross multiply
    403.96x = 557.82 × 311.62
  4. Step 4: Simplify right side
    403.96x = 173,827.87
  5. Step 5: Solve for x
    x = 173,827.87/403.96
  6. Step 6: Final answer
    x = 430.31

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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.