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Finding the Fourth Proportional to 542.60, 748.79 and 309.73

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Solution

The fourth proportional to 542.60, 748.79 and 309.73 is: 427.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.60 : 748.79 = 309.73 : x
  2. Step 2: Convert to fraction form
    542.60/748.79 = 309.73/x
  3. Step 3: Cross multiply
    542.60x = 748.79 × 309.73
  4. Step 4: Simplify right side
    542.60x = 231,921.87
  5. Step 5: Solve for x
    x = 231,921.87/542.60
  6. Step 6: Final answer
    x = 427.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.