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Finding the Fourth Proportional to 404.63, 558.42 and 257.21

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Solution

The fourth proportional to 404.63, 558.42 and 257.21 is: 354.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.63 : 558.42 = 257.21 : x
  2. Step 2: Convert to fraction form
    404.63/558.42 = 257.21/x
  3. Step 3: Cross multiply
    404.63x = 558.42 × 257.21
  4. Step 4: Simplify right side
    404.63x = 143,631.21
  5. Step 5: Solve for x
    x = 143,631.21/404.63
  6. Step 6: Final answer
    x = 354.97

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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.