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Finding the Fourth Proportional to 172.17, 256.59 and 166.32

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Solution

The fourth proportional to 172.17, 256.59 and 166.32 is: 247.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.17 : 256.59 = 166.32 : x
  2. Step 2: Convert to fraction form
    172.17/256.59 = 166.32/x
  3. Step 3: Cross multiply
    172.17x = 256.59 × 166.32
  4. Step 4: Simplify right side
    172.17x = 42,676.05
  5. Step 5: Solve for x
    x = 42,676.05/172.17
  6. Step 6: Final answer
    x = 247.87

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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.