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Finding the Fourth Proportional to 539.68, 809.28 and 385.12

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Solution

The fourth proportional to 539.68, 809.28 and 385.12 is: 577.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.68 : 809.28 = 385.12 : x
  2. Step 2: Convert to fraction form
    539.68/809.28 = 385.12/x
  3. Step 3: Cross multiply
    539.68x = 809.28 × 385.12
  4. Step 4: Simplify right side
    539.68x = 311,669.91
  5. Step 5: Solve for x
    x = 311,669.91/539.68
  6. Step 6: Final answer
    x = 577.51

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Similar ratio
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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.