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Finding the Fourth Proportional to 493.78, 681.41 and 316.56

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Solution

The fourth proportional to 493.78, 681.41 and 316.56 is: 436.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.78 : 681.41 = 316.56 : x
  2. Step 2: Convert to fraction form
    493.78/681.41 = 316.56/x
  3. Step 3: Cross multiply
    493.78x = 681.41 × 316.56
  4. Step 4: Simplify right side
    493.78x = 215,707.15
  5. Step 5: Solve for x
    x = 215,707.15/493.78
  6. Step 6: Final answer
    x = 436.85

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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.