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Finding the Fourth Proportional to 172.67, 257.09 and 171.90

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Solution

The fourth proportional to 172.67, 257.09 and 171.90 is: 255.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.67 : 257.09 = 171.90 : x
  2. Step 2: Convert to fraction form
    172.67/257.09 = 171.90/x
  3. Step 3: Cross multiply
    172.67x = 257.09 × 171.90
  4. Step 4: Simplify right side
    172.67x = 44,192.91
  5. Step 5: Solve for x
    x = 44,192.91/172.67
  6. Step 6: Final answer
    x = 255.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.