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Finding the Fourth Proportional to 493.92, 681.76 and 319.12

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Solution

The fourth proportional to 493.92, 681.76 and 319.12 is: 440.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.92 : 681.76 = 319.12 : x
  2. Step 2: Convert to fraction form
    493.92/681.76 = 319.12/x
  3. Step 3: Cross multiply
    493.92x = 681.76 × 319.12
  4. Step 4: Simplify right side
    493.92x = 217,563.25
  5. Step 5: Solve for x
    x = 217,563.25/493.92
  6. Step 6: Final answer
    x = 440.48

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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.