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Finding the Fourth Proportional to 445.96, 669.21 and 172.14

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Solution

The fourth proportional to 445.96, 669.21 and 172.14 is: 258.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.96 : 669.21 = 172.14 : x
  2. Step 2: Convert to fraction form
    445.96/669.21 = 172.14/x
  3. Step 3: Cross multiply
    445.96x = 669.21 × 172.14
  4. Step 4: Simplify right side
    445.96x = 115,197.81
  5. Step 5: Solve for x
    x = 115,197.81/445.96
  6. Step 6: Final answer
    x = 258.31

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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.