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Finding the Fourth Proportional to 345.73, 518.60 and 140.25

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Solution

The fourth proportional to 345.73, 518.60 and 140.25 is: 210.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.73 : 518.60 = 140.25 : x
  2. Step 2: Convert to fraction form
    345.73/518.60 = 140.25/x
  3. Step 3: Cross multiply
    345.73x = 518.60 × 140.25
  4. Step 4: Simplify right side
    345.73x = 72,735.95
  5. Step 5: Solve for x
    x = 72,735.95/345.73
  6. Step 6: Final answer
    x = 210.38

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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.