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Finding the Fourth Proportional to 493.05, 679.17 and 387.75

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Solution

The fourth proportional to 493.05, 679.17 and 387.75 is: 534.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.05 : 679.17 = 387.75 : x
  2. Step 2: Convert to fraction form
    493.05/679.17 = 387.75/x
  3. Step 3: Cross multiply
    493.05x = 679.17 × 387.75
  4. Step 4: Simplify right side
    493.05x = 263,348.17
  5. Step 5: Solve for x
    x = 263,348.17/493.05
  6. Step 6: Final answer
    x = 534.12

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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.