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Finding the Fourth Proportional to 539.20, 809.64 and 431.92

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Solution

The fourth proportional to 539.20, 809.64 and 431.92 is: 648.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.20 : 809.64 = 431.92 : x
  2. Step 2: Convert to fraction form
    539.20/809.64 = 431.92/x
  3. Step 3: Cross multiply
    539.20x = 809.64 × 431.92
  4. Step 4: Simplify right side
    539.20x = 349,699.71
  5. Step 5: Solve for x
    x = 349,699.71/539.20
  6. Step 6: Final answer
    x = 648.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.