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Finding the Fourth Proportional to 345.76, 518.60 and 172.38

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Solution

The fourth proportional to 345.76, 518.60 and 172.38 is: 258.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.76 : 518.60 = 172.38 : x
  2. Step 2: Convert to fraction form
    345.76/518.60 = 172.38/x
  3. Step 3: Cross multiply
    345.76x = 518.60 × 172.38
  4. Step 4: Simplify right side
    345.76x = 89,396.27
  5. Step 5: Solve for x
    x = 89,396.27/345.76
  6. Step 6: Final answer
    x = 258.55

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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.