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Finding the Fourth Proportional to 418.75, 628.13 and 172.07

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Solution

The fourth proportional to 418.75, 628.13 and 172.07 is: 258.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.75 : 628.13 = 172.07 : x
  2. Step 2: Convert to fraction form
    418.75/628.13 = 172.07/x
  3. Step 3: Cross multiply
    418.75x = 628.13 × 172.07
  4. Step 4: Simplify right side
    418.75x = 108,083.04
  5. Step 5: Solve for x
    x = 108,083.04/418.75
  6. Step 6: Final answer
    x = 258.11

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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.