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Finding the Fourth Proportional to 227.36, 312.96 and 172.16

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Solution

The fourth proportional to 227.36, 312.96 and 172.16 is: 236.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    227.36 : 312.96 = 172.16 : x
  2. Step 2: Convert to fraction form
    227.36/312.96 = 172.16/x
  3. Step 3: Cross multiply
    227.36x = 312.96 × 172.16
  4. Step 4: Simplify right side
    227.36x = 53,879.19
  5. Step 5: Solve for x
    x = 53,879.19/227.36
  6. Step 6: Final answer
    x = 236.98

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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.