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Finding the Fourth Proportional to 578.43, 797.98 and 391.86

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Solution

The fourth proportional to 578.43, 797.98 and 391.86 is: 540.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.43 : 797.98 = 391.86 : x
  2. Step 2: Convert to fraction form
    578.43/797.98 = 391.86/x
  3. Step 3: Cross multiply
    578.43x = 797.98 × 391.86
  4. Step 4: Simplify right side
    578.43x = 312,692.45
  5. Step 5: Solve for x
    x = 312,692.45/578.43
  6. Step 6: Final answer
    x = 540.59

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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.