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Finding the Fourth Proportional to 539.76, 809.68 and 155

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Solution

The fourth proportional to 539.76, 809.68 and 155 is: 232.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.76 : 809.68 = 155 : x
  2. Step 2: Convert to fraction form
    539.76/809.68 = 155/x
  3. Step 3: Cross multiply
    539.76x = 809.68 × 155
  4. Step 4: Simplify right side
    539.76x = 125,500.40
  5. Step 5: Solve for x
    x = 125,500.40/539.76
  6. Step 6: Final answer
    x = 232.51

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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.