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Finding the Fourth Proportional to 172.81, 238.45 and 102.84

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Solution

The fourth proportional to 172.81, 238.45 and 102.84 is: 141.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.81 : 238.45 = 102.84 : x
  2. Step 2: Convert to fraction form
    172.81/238.45 = 102.84/x
  3. Step 3: Cross multiply
    172.81x = 238.45 × 102.84
  4. Step 4: Simplify right side
    172.81x = 24,522.20
  5. Step 5: Solve for x
    x = 24,522.20/172.81
  6. Step 6: Final answer
    x = 141.90

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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.