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Finding the Fourth Proportional to 172.43, 258.75 and 69.70

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Solution

The fourth proportional to 172.43, 258.75 and 69.70 is: 104.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.43 : 258.75 = 69.70 : x
  2. Step 2: Convert to fraction form
    172.43/258.75 = 69.70/x
  3. Step 3: Cross multiply
    172.43x = 258.75 × 69.70
  4. Step 4: Simplify right side
    172.43x = 18,034.88
  5. Step 5: Solve for x
    x = 18,034.88/172.43
  6. Step 6: Final answer
    x = 104.59

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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.