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Finding the Fourth Proportional to 172.06, 257.99 and 80.66

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Solution

The fourth proportional to 172.06, 257.99 and 80.66 is: 120.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.06 : 257.99 = 80.66 : x
  2. Step 2: Convert to fraction form
    172.06/257.99 = 80.66/x
  3. Step 3: Cross multiply
    172.06x = 257.99 × 80.66
  4. Step 4: Simplify right side
    172.06x = 20,809.72
  5. Step 5: Solve for x
    x = 20,809.72/172.06
  6. Step 6: Final answer
    x = 120.95

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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.