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Finding the Fourth Proportional to 172.16, 257.93 and 80.66

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Solution

The fourth proportional to 172.16, 257.93 and 80.66 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.16 : 257.93 = 80.66 : x
  2. Step 2: Convert to fraction form
    172.16/257.93 = 80.66/x
  3. Step 3: Cross multiply
    172.16x = 257.93 × 80.66
  4. Step 4: Simplify right side
    172.16x = 20,805.18
  5. Step 5: Solve for x
    x = 20,805.18/172.16
  6. Step 6: Final answer
    x = 120.85

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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.