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Finding the Fourth Proportional to 577.43, 796.60 and 390.86

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Solution

The fourth proportional to 577.43, 796.60 and 390.86 is: 539.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.43 : 796.60 = 390.86 : x
  2. Step 2: Convert to fraction form
    577.43/796.60 = 390.86/x
  3. Step 3: Cross multiply
    577.43x = 796.60 × 390.86
  4. Step 4: Simplify right side
    577.43x = 311,355.09
  5. Step 5: Solve for x
    x = 311,355.09/577.43
  6. Step 6: Final answer
    x = 539.21

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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.