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Finding the Fourth Proportional to 312.12, 430.74 and 172.25

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Solution

The fourth proportional to 312.12, 430.74 and 172.25 is: 237.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.12 : 430.74 = 172.25 : x
  2. Step 2: Convert to fraction form
    312.12/430.74 = 172.25/x
  3. Step 3: Cross multiply
    312.12x = 430.74 × 172.25
  4. Step 4: Simplify right side
    312.12x = 74,194.97
  5. Step 5: Solve for x
    x = 74,194.97/312.12
  6. Step 6: Final answer
    x = 237.71

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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.