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Finding the Fourth Proportional to 478.78, 717.81 and 204.64

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Solution

The fourth proportional to 478.78, 717.81 and 204.64 is: 306.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.78 : 717.81 = 204.64 : x
  2. Step 2: Convert to fraction form
    478.78/717.81 = 204.64/x
  3. Step 3: Cross multiply
    478.78x = 717.81 × 204.64
  4. Step 4: Simplify right side
    478.78x = 146,892.64
  5. Step 5: Solve for x
    x = 146,892.64/478.78
  6. Step 6: Final answer
    x = 306.81

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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.