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Finding the Fourth Proportional to 578.30, 797.75 and 391.85

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Solution

The fourth proportional to 578.30, 797.75 and 391.85 is: 540.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.30 : 797.75 = 391.85 : x
  2. Step 2: Convert to fraction form
    578.30/797.75 = 391.85/x
  3. Step 3: Cross multiply
    578.30x = 797.75 × 391.85
  4. Step 4: Simplify right side
    578.30x = 312,596.38
  5. Step 5: Solve for x
    x = 312,596.38/578.30
  6. Step 6: Final answer
    x = 540.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.