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Finding the Fourth Proportional to 415.96, 623.93 and 138.31

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Solution

The fourth proportional to 415.96, 623.93 and 138.31 is: 207.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.96 : 623.93 = 138.31 : x
  2. Step 2: Convert to fraction form
    415.96/623.93 = 138.31/x
  3. Step 3: Cross multiply
    415.96x = 623.93 × 138.31
  4. Step 4: Simplify right side
    415.96x = 86,295.07
  5. Step 5: Solve for x
    x = 86,295.07/415.96
  6. Step 6: Final answer
    x = 207.46

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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.