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Finding the Fourth Proportional to 354.69, 531.73 and 172.21

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Solution

The fourth proportional to 354.69, 531.73 and 172.21 is: 258.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.69 : 531.73 = 172.21 : x
  2. Step 2: Convert to fraction form
    354.69/531.73 = 172.21/x
  3. Step 3: Cross multiply
    354.69x = 531.73 × 172.21
  4. Step 4: Simplify right side
    354.69x = 91,569.22
  5. Step 5: Solve for x
    x = 91,569.22/354.69
  6. Step 6: Final answer
    x = 258.17

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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.