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Finding the Fourth Proportional to 415.63, 623.87 and 172.31

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Solution

The fourth proportional to 415.63, 623.87 and 172.31 is: 258.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.63 : 623.87 = 172.31 : x
  2. Step 2: Convert to fraction form
    415.63/623.87 = 172.31/x
  3. Step 3: Cross multiply
    415.63x = 623.87 × 172.31
  4. Step 4: Simplify right side
    415.63x = 107,499.04
  5. Step 5: Solve for x
    x = 107,499.04/415.63
  6. Step 6: Final answer
    x = 258.64

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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.