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Finding the Fourth Proportional to 172.31, 258.43 and 68.19

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Solution

The fourth proportional to 172.31, 258.43 and 68.19 is: 102.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.31 : 258.43 = 68.19 : x
  2. Step 2: Convert to fraction form
    172.31/258.43 = 68.19/x
  3. Step 3: Cross multiply
    172.31x = 258.43 × 68.19
  4. Step 4: Simplify right side
    172.31x = 17,620.71
  5. Step 5: Solve for x
    x = 17,620.71/172.31
  6. Step 6: Final answer
    x = 102.26

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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.