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Finding the Fourth Proportional to 577.31, 796.90 and 391.76

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Solution

The fourth proportional to 577.31, 796.90 and 391.76 is: 540.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.31 : 796.90 = 391.76 : x
  2. Step 2: Convert to fraction form
    577.31/796.90 = 391.76/x
  3. Step 3: Cross multiply
    577.31x = 796.90 × 391.76
  4. Step 4: Simplify right side
    577.31x = 312,193.54
  5. Step 5: Solve for x
    x = 312,193.54/577.31
  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.