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Finding the Fourth Proportional to 539.91, 809.39 and 215.51

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Solution

The fourth proportional to 539.91, 809.39 and 215.51 is: 323.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.91 : 809.39 = 215.51 : x
  2. Step 2: Convert to fraction form
    539.91/809.39 = 215.51/x
  3. Step 3: Cross multiply
    539.91x = 809.39 × 215.51
  4. Step 4: Simplify right side
    539.91x = 174,428.13
  5. Step 5: Solve for x
    x = 174,428.13/539.91
  6. Step 6: Final answer
    x = 323.07

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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.