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Finding the Fourth Proportional to 415.96, 623.74 and 138.22

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Solution

The fourth proportional to 415.96, 623.74 and 138.22 is: 207.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.96 : 623.74 = 138.22 : x
  2. Step 2: Convert to fraction form
    415.96/623.74 = 138.22/x
  3. Step 3: Cross multiply
    415.96x = 623.74 × 138.22
  4. Step 4: Simplify right side
    415.96x = 86,213.34
  5. Step 5: Solve for x
    x = 86,213.34/415.96
  6. Step 6: Final answer
    x = 207.26

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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.