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Finding the Fourth Proportional to 312.73, 431.56 and 172.85

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Solution

The fourth proportional to 312.73, 431.56 and 172.85 is: 238.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.73 : 431.56 = 172.85 : x
  2. Step 2: Convert to fraction form
    312.73/431.56 = 172.85/x
  3. Step 3: Cross multiply
    312.73x = 431.56 × 172.85
  4. Step 4: Simplify right side
    312.73x = 74,593.20
  5. Step 5: Solve for x
    x = 74,593.20/312.73
  6. Step 6: Final answer
    x = 238.52

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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.