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Finding the Fourth Proportional to 404.65, 558.25 and 257.23

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Solution

The fourth proportional to 404.65, 558.25 and 257.23 is: 354.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.65 : 558.25 = 257.23 : x
  2. Step 2: Convert to fraction form
    404.65/558.25 = 257.23/x
  3. Step 3: Cross multiply
    404.65x = 558.25 × 257.23
  4. Step 4: Simplify right side
    404.65x = 143,596.61
  5. Step 5: Solve for x
    x = 143,596.61/404.65
  6. Step 6: Final answer
    x = 354.87

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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.