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Finding the Fourth Proportional to 578.12, 867.49 and 317.79

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Solution

The fourth proportional to 578.12, 867.49 and 317.79 is: 476.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.12 : 867.49 = 317.79 : x
  2. Step 2: Convert to fraction form
    578.12/867.49 = 317.79/x
  3. Step 3: Cross multiply
    578.12x = 867.49 × 317.79
  4. Step 4: Simplify right side
    578.12x = 275,678.85
  5. Step 5: Solve for x
    x = 275,678.85/578.12
  6. Step 6: Final answer
    x = 476.86

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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.