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Finding the Fourth Proportional to 172.13, 257.96 and 120.49

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Solution

The fourth proportional to 172.13, 257.96 and 120.49 is: 180.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.13 : 257.96 = 120.49 : x
  2. Step 2: Convert to fraction form
    172.13/257.96 = 120.49/x
  3. Step 3: Cross multiply
    172.13x = 257.96 × 120.49
  4. Step 4: Simplify right side
    172.13x = 31,081.26
  5. Step 5: Solve for x
    x = 31,081.26/172.13
  6. Step 6: Final answer
    x = 180.57

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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.