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Finding the Fourth Proportional to 254.37, 380.87 and 172.05

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Solution

The fourth proportional to 254.37, 380.87 and 172.05 is: 257.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.37 : 380.87 = 172.05 : x
  2. Step 2: Convert to fraction form
    254.37/380.87 = 172.05/x
  3. Step 3: Cross multiply
    254.37x = 380.87 × 172.05
  4. Step 4: Simplify right side
    254.37x = 65,527.82
  5. Step 5: Solve for x
    x = 65,527.82/254.37
  6. Step 6: Final answer
    x = 257.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.