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Finding the Fourth Proportional to 172.84, 238.68 and 129.10

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Solution

The fourth proportional to 172.84, 238.68 and 129.10 is: 178.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.84 : 238.68 = 129.10 : x
  2. Step 2: Convert to fraction form
    172.84/238.68 = 129.10/x
  3. Step 3: Cross multiply
    172.84x = 238.68 × 129.10
  4. Step 4: Simplify right side
    172.84x = 30,813.59
  5. Step 5: Solve for x
    x = 30,813.59/172.84
  6. Step 6: Final answer
    x = 178.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.