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Finding the Fourth Proportional to 318.73, 478.56 and 251.08

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Solution

The fourth proportional to 318.73, 478.56 and 251.08 is: 376.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.73 : 478.56 = 251.08 : x
  2. Step 2: Convert to fraction form
    318.73/478.56 = 251.08/x
  3. Step 3: Cross multiply
    318.73x = 478.56 × 251.08
  4. Step 4: Simplify right side
    318.73x = 120,156.84
  5. Step 5: Solve for x
    x = 120,156.84/318.73
  6. Step 6: Final answer
    x = 376.99

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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.