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Finding the Fourth Proportional to 345.93, 518.95 and 172.61

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Solution

The fourth proportional to 345.93, 518.95 and 172.61 is: 258.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.93 : 518.95 = 172.61 : x
  2. Step 2: Convert to fraction form
    345.93/518.95 = 172.61/x
  3. Step 3: Cross multiply
    345.93x = 518.95 × 172.61
  4. Step 4: Simplify right side
    345.93x = 89,575.96
  5. Step 5: Solve for x
    x = 89,575.96/345.93
  6. Step 6: Final answer
    x = 258.94

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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.