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Finding the Fourth Proportional to 578.48, 866.81 and 318.09

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Solution

The fourth proportional to 578.48, 866.81 and 318.09 is: 476.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.48 : 866.81 = 318.09 : x
  2. Step 2: Convert to fraction form
    578.48/866.81 = 318.09/x
  3. Step 3: Cross multiply
    578.48x = 866.81 × 318.09
  4. Step 4: Simplify right side
    578.48x = 275,722.00
  5. Step 5: Solve for x
    x = 275,722.00/578.48
  6. Step 6: Final answer
    x = 476.63

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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.