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Finding the Fourth Proportional to 539.88, 809.70 and 385.34

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Solution

The fourth proportional to 539.88, 809.70 and 385.34 is: 577.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.88 : 809.70 = 385.34 : x
  2. Step 2: Convert to fraction form
    539.88/809.70 = 385.34/x
  3. Step 3: Cross multiply
    539.88x = 809.70 × 385.34
  4. Step 4: Simplify right side
    539.88x = 312,009.80
  5. Step 5: Solve for x
    x = 312,009.80/539.88
  6. Step 6: Final answer
    x = 577.92

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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.