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Finding the Fourth Proportional to 231.26, 318.87 and 172.94

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Solution

The fourth proportional to 231.26, 318.87 and 172.94 is: 238.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.26 : 318.87 = 172.94 : x
  2. Step 2: Convert to fraction form
    231.26/318.87 = 172.94/x
  3. Step 3: Cross multiply
    231.26x = 318.87 × 172.94
  4. Step 4: Simplify right side
    231.26x = 55,143.78
  5. Step 5: Solve for x
    x = 55,143.78/231.26
  6. Step 6: Final answer
    x = 238.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.