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Finding the Fourth Proportional to 429.68, 644.24 and 173.20

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Solution

The fourth proportional to 429.68, 644.24 and 173.20 is: 259.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.68 : 644.24 = 173.20 : x
  2. Step 2: Convert to fraction form
    429.68/644.24 = 173.20/x
  3. Step 3: Cross multiply
    429.68x = 644.24 × 173.20
  4. Step 4: Simplify right side
    429.68x = 111,582.37
  5. Step 5: Solve for x
    x = 111,582.37/429.68
  6. Step 6: Final answer
    x = 259.69

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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.