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Finding the Fourth Proportional to 312.54, 431.31 and 172.67

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Solution

The fourth proportional to 312.54, 431.31 and 172.67 is: 238.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.54 : 431.31 = 172.67 : x
  2. Step 2: Convert to fraction form
    312.54/431.31 = 172.67/x
  3. Step 3: Cross multiply
    312.54x = 431.31 × 172.67
  4. Step 4: Simplify right side
    312.54x = 74,472.79
  5. Step 5: Solve for x
    x = 74,472.79/312.54
  6. Step 6: Final answer
    x = 238.29

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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.