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Finding the Fourth Proportional to 172.20, 256.97 and 156.87

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Solution

The fourth proportional to 172.20, 256.97 and 156.87 is: 234.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.20 : 256.97 = 156.87 : x
  2. Step 2: Convert to fraction form
    172.20/256.97 = 156.87/x
  3. Step 3: Cross multiply
    172.20x = 256.97 × 156.87
  4. Step 4: Simplify right side
    172.20x = 40,310.10
  5. Step 5: Solve for x
    x = 40,310.10/172.20
  6. Step 6: Final answer
    x = 234.09

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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.