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Finding the Fourth Proportional to 539.81, 809.91 and 193.13

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Solution

The fourth proportional to 539.81, 809.91 and 193.13 is: 289.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.81 : 809.91 = 193.13 : x
  2. Step 2: Convert to fraction form
    539.81/809.91 = 193.13/x
  3. Step 3: Cross multiply
    539.81x = 809.91 × 193.13
  4. Step 4: Simplify right side
    539.81x = 156,417.92
  5. Step 5: Solve for x
    x = 156,417.92/539.81
  6. Step 6: Final answer
    x = 289.76

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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.