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Finding the Fourth Proportional to 404.76, 558.82 and 311.32

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Solution

The fourth proportional to 404.76, 558.82 and 311.32 is: 429.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.76 : 558.82 = 311.32 : x
  2. Step 2: Convert to fraction form
    404.76/558.82 = 311.32/x
  3. Step 3: Cross multiply
    404.76x = 558.82 × 311.32
  4. Step 4: Simplify right side
    404.76x = 173,971.84
  5. Step 5: Solve for x
    x = 173,971.84/404.76
  6. Step 6: Final answer
    x = 429.81

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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.