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Finding the Fourth Proportional to 418.90, 628.95 and 236.65

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Solution

The fourth proportional to 418.90, 628.95 and 236.65 is: 355.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.90 : 628.95 = 236.65 : x
  2. Step 2: Convert to fraction form
    418.90/628.95 = 236.65/x
  3. Step 3: Cross multiply
    418.90x = 628.95 × 236.65
  4. Step 4: Simplify right side
    418.90x = 148,841.02
  5. Step 5: Solve for x
    x = 148,841.02/418.90
  6. Step 6: Final answer
    x = 355.31

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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.