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Finding the Fourth Proportional to 312.76, 431.60 and 172.88

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Solution

The fourth proportional to 312.76, 431.60 and 172.88 is: 238.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.76 : 431.60 = 172.88 : x
  2. Step 2: Convert to fraction form
    312.76/431.60 = 172.88/x
  3. Step 3: Cross multiply
    312.76x = 431.60 × 172.88
  4. Step 4: Simplify right side
    312.76x = 74,615.01
  5. Step 5: Solve for x
    x = 74,615.01/312.76
  6. Step 6: Final answer
    x = 238.57

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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.