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Finding the Fourth Proportional to 416.39, 623.66 and 172.17

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Solution

The fourth proportional to 416.39, 623.66 and 172.17 is: 257.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.39 : 623.66 = 172.17 : x
  2. Step 2: Convert to fraction form
    416.39/623.66 = 172.17/x
  3. Step 3: Cross multiply
    416.39x = 623.66 × 172.17
  4. Step 4: Simplify right side
    416.39x = 107,374.68
  5. Step 5: Solve for x
    x = 107,374.68/416.39
  6. Step 6: Final answer
    x = 257.87

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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.