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Finding the Fourth Proportional to 312.38, 431.11 and 172.50

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Solution

The fourth proportional to 312.38, 431.11 and 172.50 is: 238.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.38 : 431.11 = 172.50 : x
  2. Step 2: Convert to fraction form
    312.38/431.11 = 172.50/x
  3. Step 3: Cross multiply
    312.38x = 431.11 × 172.50
  4. Step 4: Simplify right side
    312.38x = 74,365.24
  5. Step 5: Solve for x
    x = 74,365.24/312.38
  6. Step 6: Final answer
    x = 238.06

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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.