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Finding the Fourth Proportional to 429.44, 644.16 and 172.80

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Solution

The fourth proportional to 429.44, 644.16 and 172.80 is: 259.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.44 : 644.16 = 172.80 : x
  2. Step 2: Convert to fraction form
    429.44/644.16 = 172.80/x
  3. Step 3: Cross multiply
    429.44x = 644.16 × 172.80
  4. Step 4: Simplify right side
    429.44x = 111,310.85
  5. Step 5: Solve for x
    x = 111,310.85/429.44
  6. Step 6: Final answer
    x = 259.20

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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.