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Finding the Fourth Proportional to 172.20, 256.49 and 164.30

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Solution

The fourth proportional to 172.20, 256.49 and 164.30 is: 244.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.20 : 256.49 = 164.30 : x
  2. Step 2: Convert to fraction form
    172.20/256.49 = 164.30/x
  3. Step 3: Cross multiply
    172.20x = 256.49 × 164.30
  4. Step 4: Simplify right side
    172.20x = 42,141.31
  5. Step 5: Solve for x
    x = 42,141.31/172.20
  6. Step 6: Final answer
    x = 244.72

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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.