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Finding the Fourth Proportional to 416.25, 623.79 and 172.62

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Solution

The fourth proportional to 416.25, 623.79 and 172.62 is: 258.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.25 : 623.79 = 172.62 : x
  2. Step 2: Convert to fraction form
    416.25/623.79 = 172.62/x
  3. Step 3: Cross multiply
    416.25x = 623.79 × 172.62
  4. Step 4: Simplify right side
    416.25x = 107,678.63
  5. Step 5: Solve for x
    x = 107,678.63/416.25
  6. Step 6: Final answer
    x = 258.69

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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.