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Finding the Fourth Proportional to 404.10, 558.36 and 331.20

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Solution

The fourth proportional to 404.10, 558.36 and 331.20 is: 457.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.10 : 558.36 = 331.20 : x
  2. Step 2: Convert to fraction form
    404.10/558.36 = 331.20/x
  3. Step 3: Cross multiply
    404.10x = 558.36 × 331.20
  4. Step 4: Simplify right side
    404.10x = 184,928.83
  5. Step 5: Solve for x
    x = 184,928.83/404.10
  6. Step 6: Final answer
    x = 457.63

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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.