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Finding the Fourth Proportional to 577.87, 797.21 and 391.29

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Solution

The fourth proportional to 577.87, 797.21 and 391.29 is: 539.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.87 : 797.21 = 391.29 : x
  2. Step 2: Convert to fraction form
    577.87/797.21 = 391.29/x
  3. Step 3: Cross multiply
    577.87x = 797.21 × 391.29
  4. Step 4: Simplify right side
    577.87x = 311,938.34
  5. Step 5: Solve for x
    x = 311,938.34/577.87
  6. Step 6: Final answer
    x = 539.81

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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.