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Finding the Fourth Proportional to 539.80, 809.76 and 265.90

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Solution

The fourth proportional to 539.80, 809.76 and 265.90 is: 398.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.80 : 809.76 = 265.90 : x
  2. Step 2: Convert to fraction form
    539.80/809.76 = 265.90/x
  3. Step 3: Cross multiply
    539.80x = 809.76 × 265.90
  4. Step 4: Simplify right side
    539.80x = 215,315.18
  5. Step 5: Solve for x
    x = 215,315.18/539.80
  6. Step 6: Final answer
    x = 398.88

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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.