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Finding the Fourth Proportional to 539.31, 809.43 and 214.91

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Solution

The fourth proportional to 539.31, 809.43 and 214.91 is: 322.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.31 : 809.43 = 214.91 : x
  2. Step 2: Convert to fraction form
    539.31/809.43 = 214.91/x
  3. Step 3: Cross multiply
    539.31x = 809.43 × 214.91
  4. Step 4: Simplify right side
    539.31x = 173,954.60
  5. Step 5: Solve for x
    x = 173,954.60/539.31
  6. Step 6: Final answer
    x = 322.55

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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.