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Finding the Fourth Proportional to 345.92, 518.72 and 172.58

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Solution

The fourth proportional to 345.92, 518.72 and 172.58 is: 258.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.92 : 518.72 = 172.58 : x
  2. Step 2: Convert to fraction form
    345.92/518.72 = 172.58/x
  3. Step 3: Cross multiply
    345.92x = 518.72 × 172.58
  4. Step 4: Simplify right side
    345.92x = 89,517.24
  5. Step 5: Solve for x
    x = 89,517.24/345.92
  6. Step 6: Final answer
    x = 258.78

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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.