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Finding the Fourth Proportional to 418.65, 628.59 and 405.33

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Solution

The fourth proportional to 418.65, 628.59 and 405.33 is: 608.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.65 : 628.59 = 405.33 : x
  2. Step 2: Convert to fraction form
    418.65/628.59 = 405.33/x
  3. Step 3: Cross multiply
    418.65x = 628.59 × 405.33
  4. Step 4: Simplify right side
    418.65x = 254,786.38
  5. Step 5: Solve for x
    x = 254,786.38/418.65
  6. Step 6: Final answer
    x = 608.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.