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Finding the Fourth Proportional to 415.72, 623.20 and 172.09

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Solution

The fourth proportional to 415.72, 623.20 and 172.09 is: 257.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.72 : 623.20 = 172.09 : x
  2. Step 2: Convert to fraction form
    415.72/623.20 = 172.09/x
  3. Step 3: Cross multiply
    415.72x = 623.20 × 172.09
  4. Step 4: Simplify right side
    415.72x = 107,246.49
  5. Step 5: Solve for x
    x = 107,246.49/415.72
  6. Step 6: Final answer
    x = 257.98

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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.