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Finding the Fourth Proportional to 172.60, 238.19 and 102.65

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Solution

The fourth proportional to 172.60, 238.19 and 102.65 is: 141.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.60 : 238.19 = 102.65 : x
  2. Step 2: Convert to fraction form
    172.60/238.19 = 102.65/x
  3. Step 3: Cross multiply
    172.60x = 238.19 × 102.65
  4. Step 4: Simplify right side
    172.60x = 24,450.42
  5. Step 5: Solve for x
    x = 24,450.42/172.60
  6. Step 6: Final answer
    x = 141.66

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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.