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Finding the Fourth Proportional to 345.57, 518.39 and 172.07

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Solution

The fourth proportional to 345.57, 518.39 and 172.07 is: 258.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.57 : 518.39 = 172.07 : x
  2. Step 2: Convert to fraction form
    345.57/518.39 = 172.07/x
  3. Step 3: Cross multiply
    345.57x = 518.39 × 172.07
  4. Step 4: Simplify right side
    345.57x = 89,197.53
  5. Step 5: Solve for x
    x = 89,197.53/345.57
  6. Step 6: Final answer
    x = 258.11

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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.