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Finding the Fourth Proportional to 578.08, 797.64 and 391.92

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Solution

The fourth proportional to 578.08, 797.64 and 391.92 is: 540.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.08 : 797.64 = 391.92 : x
  2. Step 2: Convert to fraction form
    578.08/797.64 = 391.92/x
  3. Step 3: Cross multiply
    578.08x = 797.64 × 391.92
  4. Step 4: Simplify right side
    578.08x = 312,611.07
  5. Step 5: Solve for x
    x = 312,611.07/578.08
  6. Step 6: Final answer
    x = 540.77

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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.