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Finding the Fourth Proportional to 319.73, 478.68 and 294.21

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Solution

The fourth proportional to 319.73, 478.68 and 294.21 is: 440.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.73 : 478.68 = 294.21 : x
  2. Step 2: Convert to fraction form
    319.73/478.68 = 294.21/x
  3. Step 3: Cross multiply
    319.73x = 478.68 × 294.21
  4. Step 4: Simplify right side
    319.73x = 140,833.64
  5. Step 5: Solve for x
    x = 140,833.64/319.73
  6. Step 6: Final answer
    x = 440.48

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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.