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Finding the Fourth Proportional to 221.47, 331.19 and 172.16

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Solution

The fourth proportional to 221.47, 331.19 and 172.16 is: 257.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.47 : 331.19 = 172.16 : x
  2. Step 2: Convert to fraction form
    221.47/331.19 = 172.16/x
  3. Step 3: Cross multiply
    221.47x = 331.19 × 172.16
  4. Step 4: Simplify right side
    221.47x = 57,017.04
  5. Step 5: Solve for x
    x = 57,017.04/221.47
  6. Step 6: Final answer
    x = 257.45

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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.