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Finding the Fourth Proportional to 172.91, 259.31 and 63.21

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Solution

The fourth proportional to 172.91, 259.31 and 63.21 is: 94.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.91 : 259.31 = 63.21 : x
  2. Step 2: Convert to fraction form
    172.91/259.31 = 63.21/x
  3. Step 3: Cross multiply
    172.91x = 259.31 × 63.21
  4. Step 4: Simplify right side
    172.91x = 16,390.99
  5. Step 5: Solve for x
    x = 16,390.99/172.91
  6. Step 6: Final answer
    x = 94.79

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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.