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Finding the Fourth Proportional to 577.62, 797.60 and 391.72

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Solution

The fourth proportional to 577.62, 797.60 and 391.72 is: 540.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.62 : 797.60 = 391.72 : x
  2. Step 2: Convert to fraction form
    577.62/797.60 = 391.72/x
  3. Step 3: Cross multiply
    577.62x = 797.60 × 391.72
  4. Step 4: Simplify right side
    577.62x = 312,435.87
  5. Step 5: Solve for x
    x = 312,435.87/577.62
  6. Step 6: Final answer
    x = 540.90

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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.